114 services he had much pleasure in acknowledging in his work ;' from which it must be inferred that my assistance was n01 had, or needed, until the latter part of the inquiry. Now, however, that Mr. Wakley has exposed the true position oj Dr. Hassall, and even stated that he paid " several sums for chemical analyses made by Dr. Letheby," Dr. Hassall admits that, during the first year I made 16 analyses for him, during the second 9, during the third 59, and during the fourth 12 ; besides

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... 43 analyses of snuff, and 57 of opium. On looking over my laboratory book, I find that during the four years alluded to I made 291 analyses for Dr. Hassall, of which 13 were for adulterations of chicory and cocoa, 20 for bread, flour, and salt, 11 for bitter beer and pale ale (these being all the analyses necessary for the report on this subject), 7 for vinegar, 25 for tobacco, 45 for snuffs, 63 for opiums, 10 for confectionery, 4 for cod-liver oil, and about 20 for castor oil ; the rest were, for the most part, of things which did not immediately concern the Commission ; they were of matters which he had received for examination in the way of business. and which he could not investigate. Others were for his review of Dr. Golding Bird, in the 12th volume of the Britialc and 1'oneigt lfedico-C7zirurryiccsL Review, where they are published, with a mere apology in the way of acknowledgment ; and the others were for a paper of his which was read before the Royal Society, and printed in their " Transactions. " Indeed, I think it but right to say that the whole of the chemistry of fhat paper is a verbatim copy of my notes to him on the subject ; and when he sent the proofs to me for correction, I do assure you I was astonished at the boldness of his conduct, and London, July 31.