" I introduce no reservations into the judgment, because I think it unnecessary. The case before me involves no claim of damages, and no otherwise as regards the future, than that the respondents undertake to confine their calcining operations to the months of November, December, and January. The parties by their minutes have only enabled me, without further argument, to give effect to the opinion which I had formed (prima facie) on hearing the evidence, that the respondents ought to be restrained from calcining in the other months. The complainer is content with their undertaking. What may be the result of the respondents' use of the liberty which they retain, or what rights or remedies may thereupon arise to the complainer, cannot be now considered or be affected by what is now done."
" When the Lord Ordinary came to hear the parties on the evidence it was admitted that there was no question of law between them. The Lord Ordinary has only to decide a question of fact. It is this-viz., whether the pursuer's estate has been injured by the calcining operations carried on by the defenders. The pursuer conceded that he must establish a substantial injury. The defenders admitted that if he did so he was in law entitled to the remedy which he sought.
" The evidence which has been led is very voluminous and very conflicting.
" The defenders began to calcine in March 1877, and they have since continued to do so. They have three places-viz., No. 1 Incline, No. 2 Incline, and the New Hearths. At the first and third of these places the burning has been limited to the winter months, with the exception of the year 1877, when it began at No. 1 Incline on 13th March, and finished on 28th April. At the second it continued into spring, during the years 1877, 1878, and 1880.
" Incline No. 1 is situated very near the march of the lands of Glencorse, being not so much as 200 yards to the south of them. Incline No. 2 is close to Belwood. The New Hearths are about 1000 yards to the south of Glencorse, though considerably nearer Belwood. They are to the south-east of that estate. The pursuer complains chiefly of injury to the lands of Glencorse, though he also alleges that Belwood has suffered.
" The case of the pursuer is, that prior to 1877 the trees on his estates were remarkably thriving; that the first appearance of injury to the plantations was in the summer of 1877, immediately after the calcining in the spring of that year; that the injury has increased, and is increasing very rapidly ; and that it is wholly due to the calcining. A large number of witnesses of skill support this view, and say that the injury from calcining is of the most marked and obvious kind.
" In this state of the evidence it is necessary to examine the reasons why the calcination of ironstone may be injurious to vegetation.
" The raw ore which is calcined by the defenders contains about one per cent of combustible sulphur. This substance, when burnt in the open air, gives off suphurous acid, which gradually becomes sulphuric acid by the absorption of another atom of oxygen. It is not disputed that sulphurous acid and sulphuric acid, if present in sufficient quantity, are injurious to vegetable life. The question is, whether these acids, or either of them, reach the pursuer's land in such quantities as to injure vegetation.
" But does the smoke contain or carry with it the acids in destructive or injurious quantity 1 Experiments have been made to test this point; but a very important one has been so conducted as not to give, by itself at least, perfectly reliable results. The Lord Ordinary refers to what has been called the rain test. The rain-water was collected in monthly quantities at six different stations in order to determine whether there was an increase of sulphuric acid in the air when the bings were burning. It is obvious that this experiment could never
" The observers, Professors Dewar and Dittmar, draw the inference that the increase was due to an increase of free sulphuric acid in the air. But the soundness of the inference is not free from doubt, and it appears to the Lord Ordinary that the doubt could have been obviated had the experiment been conducted with more exactitude. If the acid was free in the air, in which state it is alone injurious, it would enter the collecting vessels as a free acid, and the Lord Ordinary does not see why an acid reaction could not have been obtained, which would of course have been conclusive. But, unfortunately, the vessels which were used were new glass bottles, of an ordinary or inferior kind of glass, and the glass contained soda, which would be taken up by any free sulphuric acid which entered the bottle. The liquid was therefore a solution of a sulphate. But of what sulphate ? Professor Dewar assumes rather than proves it to be a sulphate of soda 128 F. If it were, the soda could only come from the bottle, and the acid must have been free in the air; for the air would not furnish any material addition of soda. But whether it was sulphate of soda has not been conclusively determined.
" It is said that the increase of sulphate might be and was probably due to an addition of sulphate of ammonia. Professors Dittmar and Dewar did not think that this was possible, and hence they did not determine the base of the sulphate. But the scientific witnesses for the defenders say that it is likely that a large portion of the sulphurous or sulphuric acid would combine with ammonia during the process of calcining, and hence that the air would contain an addition of sulphate of ammonia which would not do any harm. They do not, however, pretend that no sulphurous acid is given off in a free condition. Dr Voelcker computes it to amount to a quarter per cent of the entire sulphur.
" Another experiment was, however, made to determine whether there was free acid, and no objection seems to be stated against it, either as regards its theory or the manner in which it was carried out. It is detailed in the evidence of Professor Dittmar at pp. 1ll and 112, and it shews a marked increase of acid at various places, and, as the Lord Ordinary understands, of free acid for the theory of the experiment was to introduce a re-agent, in order to combine with such sulphurous acid as might exist in the air, and thence to determine the amount of the acid. It may be observed, with respect to the experiment made on17th December 1880 , that the amount of free acid found at Sergeant's Croft was 2.8 volumes per million volumes of air; and the note of the 'smoke observer' for that day is ' smoke at No. 1 Incline, Sergeant's Croft Plantation, Pheasant Corner, and Loganbank Grounds,' The evidence leads the Lord Ordinary to believe that the acid was present in such quantity as to injure; indeed it is not said by any one that such a proportion of acid to air as is indicated in these experiments would not be injurious. The Lord Ordinary may further notice the collection of water from the forester's house, and from a birch tree in Sergeant's Croft, which go a long way to shew the dissemination of sulphuric acid in injurious quantity.
" One other test may be referred to of a practical kind. Mr Dupré, a witness for the defenders, says, that if ' discomfort was at once felt by an ordinary observer the fumes that caused that discomfort would be injurious to vegetation.' -See Proof, p. 280. The case has occurred, and has been spoken to by several witnesses. The Lord Ordinary may refer, in particular, to the evidence of J. H. Dickson, p. 96.
" The defenders have, no doubt, some strong points in their favour. They have given evidence to shew (1) that the calcination of ironstone, containing no more combustible sulphur than that which is calcined by the defenders, is not injurious to vegetation (see the evidence of Dr Sloan and Dr Lawrence) ; and (2) that when an ore containing much more sulphur is calcined, the injury does not extend beyond 300 or 400 yards at the most-(See the evidence of Professor Stockhardt). But these are isolated instances, which have not been examined on their own merits, and though very important, cannot, it is thought, outweigh the evidence which the pursuer has brought in this case.
" But they further found on the fact that the trees and hedges nearest to the bings have not suffered. It is certainly natural to suppose that the nearest trees and hedges would suffer first, and it is singular that this is not so in the present case. But this may be explained on the ground that the fumes have been carried past them or over them. It is impossible to speculate with any certainty on the height to which the fumes would rise, or the places to which they would be carried with destructive effect, or on the causes which may explain why some trees may resist while others fail. The circumstance founded on by the defenders is no doubt much in their favour, but it cannot overcome what the Lord Ordinary holds to be the positive evidence of the presence of injurious fumes in the pursuer's estates, and the injury resulting therefrom.
" It remains to consider how far the prohibition by the Court against calcining is to extend. This must necessarily be fixed in a somewhat arbitrary manner. But if the view which the Lord Ordinary has taken of the evidence be correct he thinks that it would not be safe to put the limit at less than a mile."