Examination continued.—“The lungs were not congested, nor was the brain. In the case of animals which have recovered the paroxysms have subsided gradually. I never knew a severe paroxysm followed by a long interval of repose. I have experimented upon the discovery of strychnia in the bodies of animals in various stages of decomposition, from a few hours after death up to the forty-third day, in which latter case the body was quite putrid. It has never happened to me to fail to discover the poison. I have experimented in about fifteen cases.”
Question.—“Supposing a person to have died under the influence of strychnia poison in the first paroxysm, and his stomach to have been taken out and put into a jar on the sixth day after death, must strychnia have, by a proper analysis, been found in the body?”
Answer.—“Yes. If the strychnia be pure, such as is almost invariably found among medical men and druggists, the test is nitric acid, which gives a red colour, which in a great measure disappears on the addition of protochloride of tin.[55] If the strychnia be pure, it does not undergo any change on the addition of sulphuric acid, but on the addition of a mixture of bichromate of potash, with several other substances it produces a beautiful purple, which changes to varying shades until it gets to be a dirty red. There are several other tests. In this case the stomach was not, in my opinion, in an unfavourable condition for examination. The circumstances attending its position in the jar and its removal to London would give a little more trouble, but would not otherwise affect the result. If the deceased had died from strychnia poison it ought to have been found in the liver, spleen, and kidneys. I have seen this poison found in similar portions of animals which had been killed by it. I have also seen it found in the blood; that was by Mr. Herapath, of Bristol.”
Question.—“Could the analyses be defeated or confused by the existence in the stomach of any other substance which would produce the same colours?”
Answer.—“No. Supposing that pyroxanthine and salicine were in the parts examined, their existence would not defeat the analysis. Pyroxanthine is very unlikely to be found in the stomach. It is one of the rarest and most difficult to be obtained. The distinction between pyroxanthine and strychnia is quite evident. Pyroxanthine changes to a deep purple on the addition of sulphuric acid alone, and the bichromate of potash spoils the colour. In strychnia no change is produced by sulphuric acid. It requires the addition of the bichromate to produce the colour.”
Question.—“Supposing the death to have been caused by a dose of strychnia, not more than sufficient to destroy the animal, would it be so diffused by the process of absorption that you would not be able by these tests to detect it in any portion of the system?”
Answer.—“No; I believe it would not. That question had occupied my attention before I was called upon to give evidence in this trial. My reason for stating that strychnia when it has done its work continues as strychnia in the system is, that those who say some change takes place, argue, that as food undergoes a change, so does poison; it becomes decomposed. But the change in food takes place in digestion; consequently its traces are not found in the blood. Substances like strychnia are absorbed without digestion, and may be obtained unchanged from the blood. They may be administered in various ways.”
Question.—“In your judgment, will any amount of putrefaction prevent the discovery of strychnia?”
Answer.—“To say that it is absolutely indestructible would be absurd, but within ordinary limits, no. I have found it at the end of forty days. The emptier the stomach, the quicker the action of strychnia.”
On cross-examination by the Attorney-General, the witness, who, to judge from the expressions that passed between them, assumed an antagonistic position to the prosecution, after admitting that perhaps half of his sixty experiments had been made in conjunction with Mr. Morley, and spread over thirty years; that some had been made after the Leeds case, and some in reference to the present, and that he had been in consultation with the prisoner’s attorney since the case at Leeds, to whom he had transmitted its details, he thus continued:—