ometimes found amongst the rock； it would soon have been empty； and the phenomenon have ceased。 But far from that。 According to Simon Ford； the fire…damp escaped incessantly； and from that fact the existence of an important vein might be considered certain。 Consequently； the riches of the Dochart pit were not entirely exhausted。 The chief question now was； whether this was merely a vein which would yield paratively little； or a bed occupying a large extent。
Harry； who preceded his father and the engineer； stopped。
〃Here we are！〃 exclaimed the old miner。 〃At last； thank Heaven！ you are here； Mr。 Starr； and we shall soon know。〃 The old overman's voice trembled slightly。
〃Be calm； my man！〃 said the engineer。 〃I am as excited as you are； but we must not lose time。〃
The gallery at this end of the pit widened into a sort of dark cave。 No shaft had been pierced in this part； and the gallery； bored into the bowels of the earth； had no direct munication with the surface of the earth。
James Starr； with intense interest； examined the place in which they were standing。 On the walls of the cavern the marks of the pick could still be seen； and even holes in which the rock had been blasted； near the termination of the working。 The schist was excessively hard； and it had not been necessary to bank up the end of the tunnel where the works had e to an end。 There the vein had failed； between the schist and the tertiary sandstone。 From this very place had been extracted the last piece of coal from the Dochart pit。
〃We must attack the dyke；〃 said Ford； raising his pick； 〃for at the other side of the break； at more or less depth； we shall assuredly find the vein； the existence of which I assert。〃
〃And was it on the surface of these rocks that you found out the fire…damp？〃 asked James Starr。
〃Just there； sir；〃 returned Ford； 〃and I was able to light it only by bringing my lamp near to the cracks in the rock。 Harry has done it as well as I。〃
〃At what height？〃 asked Starr。
〃Ten feet from the ground；〃 replied Harry。
James Starr had seated himself on a rock。 After critically inhaling the air of the cavern； he gazed at the two miners； almost as if doubting their words； decided as they were。 In fact； carburetted hydrogen is not pletely scentless； and the engineer； whose sense of smell was very keen； was astonished that it had not revealed the presence of the explosive gas。 At any rate； if the gas had mingled at all with the surrounding air； it could only be in a very small stream。 There was no danger of an explosion； and they might without fear open the safety lamp to try the experiment； just as the old miner had done before。
What troubled James Starr was； not lest too much gas
mingled with the air； but lest there should be little or none。
〃Could they have been mistaken？〃 he murmured。 〃No： these men know what they are about。 And yet……〃
He waited； not without some anxiety； until Simon Ford's phenomenon should have taken place。 But just then it seemed that Harry； like himself； had remarked the absence of the characteristic odor of fire…damp； for he exclaimed in an altered voice； 〃Father； I should say the gas was no longer escaping through the cracks！〃
〃No longer！〃 cried the old miner……and； pressing his lips tight together； he snuffed the air several times。
Then； all at once； with a sudden movement； 〃Hand me your lamp； Harry；〃 he said。
Ford took the lamp with a trembling hand。 He drew off the wire gauze case which surrounded the wick； and the flame burned in the open air。
As they had expected； there was no explosion； but； what was more serious； there was not even the slight crackling which indicates the presence of a small quantity of firedamp。 Simon took the stick which Harry was holding； fixed his lamp to the end of it； and raised it high above his head； up to where the gas； by reason of its buoyancy； would naturally accumulate。 The flame of the lamp； burning straight and clear； revealed no trace of the carburetted hydrogen。
〃Close to the wall；〃 said the engineer。
〃Yes；〃 responded Ford； carrying the lamp to that part of the wall at which he and his son had； the evening before； proved the escape of gas。
The old miner's arm trembled whilst he tried to hoist the lamp up。 〃Take my place； Harry；〃 said he。
Harry took the stick； and successively presented the lamp to the different fissures in the rock； but he shook his head； for of that slight crackling peculiar to escaping fire…damp he heard nothing。 There was no flame。 Evidently not a particle of gas was escaping through the rock。
〃Nothing！〃 cried Ford； clenching his fist with a gesture rather of anger than disappointment。
A cry escaped Harry。
〃What's the matter？〃 asked Starr quickly。
〃Someone has stopped up the cracks in the schist！〃
〃Is that true？〃 exclaimed the old miner。
〃Look； father！〃 Harry was not mistaken。 The obstruction of the fissures was clearly visible by the light of the lamp。 It had been recently done with lime； leaving on the rock a long whitish mark； badly concealed with coal dust。
〃It's he！〃 exclaimed Harry。 〃It can only be he！〃
〃He？〃 repeated James Starr in amazement。
〃Yes！〃 returned the young man； 〃that mysterious being who haunts our domain； for whom I have watched a hundred times without being able to get at him……the author； we may now be certain； of that letter which was intended to hinder you from ing to see my father； Mr。 Starr； and who finally threw that stone at us in the gallery of the Yarrow shaft！ Ah！ there's no doubt about it； there is a man's hand in all that！〃
Harry spoke with such energy that conviction came instantly and fully to the engineer's mind。 As to the old overman； he was already convinced。 Besides； there they were in the presence of an undeniable fact…… the stopping…up of cracks through which gas had escaped freely the night before。
〃Take your pick； Harry；〃 cried Ford； 〃mount on my shoulders； my lad！ I am still strong enough to bear you！〃 The young man understood in an instant。 His father propped himself up against the rock。 Harry got upon his shoulders； so that with his pick he could reach the line of the fissure。 Then with quick sharp blows he attacked it。 Almost directly afterwards a slight sound was heard； like champagne escaping from a bottle……a sound monly expressed by the word 〃puff。〃
Harry again seized his lamp； and held it to the opening。 There was a slight report； and a little red flame； rather blue at its outline； flickered over the rock like a Will…o'…the…Wisp。
Harry leaped to the ground； and the old overman； unable to contain his joy； grasped the engineer's hands； exclaiming； 〃Hurrah！ hurrah！ hurrah！ Mr。 Starr。 The fire…damp burns！ the vein is there！〃
CHAPTER VII NEW ABERFOYLE
THE old overman's experiment had succeeded。 Firedamp； it is well known； is only generated in coal seams； therefore the existence of a vein of precious bustible could no longer be doubted。 As to its size and quality； that must be determined later。
〃Yes；〃 thought James Starr； 〃behind that wall lies a carboniferous bed； undiscovered by our soundings。 It is vexatious that all the apparatus of the mine； deserted for ten years； must be set up anew。 Never mind。 We have found the vein which was thought to be exhausted； and this time it shall be worked to the end！〃
〃Well； Mr。 Starr；〃 asked Ford； 〃what do you think of our discovery？ Was I wrong to trouble you？ Are you sorry to have paid this visit to the Dochart pit？〃
〃No； no； my old friend！〃 answered Starr。 〃We have not lost our time； but we shall be losing it now； if we do not return immediately to the cottage。 To…morrow we will e back here。 We will blast this wall with dynamite。 We will lay open the new vein； and after a series of soundings； if the seam appears to be large； I will form a new Aberfoyle pany； to the great satisfaction of the old shareholders。 Before three months have passed； the first corves full of coal will have been taken from the new vein。〃
〃Well said； sir！〃 cried Simon Ford。 〃The old mine will grow young again； like a widow who remarries！ The bustle of the old days will soon begin with the blows of the pick； and mattock； blasts of powder； rumbling of wagons； neighing of horses； creaking of machines！ I shall see it all again！ I hope； Mr。 Starr； that you will not think me too old to r閟um？my duties of overman？〃
〃No； Simon； no indeed！ You wear better than I do； my old friend！〃
〃And； sir； you shall be our viewer again。 May the new working last for many years； and pray Heaven I shall have the consolation of dying without seeing the end of it！〃
The old miner was overflowing with joy。 James Starr fully entered into it； but he let Ford rave for them both。 Harry alone remained thoughtful。 To his memory recurred the succession of singular； inexplicable circumstances
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attending the discovery of the new bed。 It made him uneasy about the future。
An hour afterwards； James Starr and his two panions were back in the cottage。 The engineer supped with good appetite； listening with satisfaction to all the plans unfolded by the old overman； and had it not been for his excitement about the next day's work； he would never have slept better than in the perfect stillness of the cottage。
The following day； after a substantial breakfast； James Starr； Simon Ford； Harry； and even Madge herself； took the road already traversed the day before。 All looked like regular miners。 They carried different tools； and some dynamite with which to blast the rock。 Harry； besides a large lantern； took a safety lamp； which would burn for twelve hours。 It was more than was necessary for the journey there and back； including the time for the working…… supposing a working was possible。
〃To work！ to work！〃 shouted Ford； when the party reached the further end of the passage； and he grasped a heavy crowbar and brandished it。
〃Stop one instant；〃 said Starr。 〃Let us see if any change has taken place； and if the fire…damp still escapes through the crevices。〃
〃You are right； Mr。 Starr；〃 said Harry。 〃Whoever stopped it up yesterday may have done it again to…day！〃
Madge； seated on a rock； carefully observed the excavation； and the wall which was to be blasted。
It was found that everything was just as they left it。 The crevices had undergone no alteration； the carburetted hydrogen still filtered through； though in a small stream； which was no doubt because it had had a free passage since the day before。 As the quantity was so small； it could not have formed an explosive mixture with the air inside。 James Starr and his panions could therefore proceed in security。 Besides； the air grew purer by rising to the heights of the Dochart pit； and the fire…damp； spreading through the atmosphere； would not be strong enough to make any explosion。
〃To work； then！〃 repeated Ford； and soon the rock flew in splinters under his skillful blows。 The break was chiefly posed of pudding…stone； interspersed with sandstone and schist； such as is most often met with between the coal
veins。 James Starr picked up some of the pieces； and examined them carefully； hoping to discover some trace of coal。
Starr having chosen the place where the holes were to be drilled； they were rapidly bored by Harry。