74 Observations on

On the subject of this section I shallobserve that Dr. Millman having been soobliging as to inform me that he had foundthat bile is prevented from becoming putridmuch longer by being impregnated withfixed air, than it could otherwise be; Iwas desirous of trying what effect the im-pregnation with nitrous air would haveupon it. Accordingly, on the 19th ofFebruary 1777, I impregnated a quantityof ox bile, with which he supplied me,with nitrous air ; when, from being viscid,it presently became limpid like water, andassumed a brownish hue, without deposit-ing any thing that I could perceive. Thisbile continued perfectly sweet till the 20thof March following, when it was packedUp, along with other things, and removedfrom London into the country. Examin-ing it some time afterwards, I found ithad contracted a smell of putrefaction, andon the 23d of April, it was quite putrid.The fame brown colour continued, but ithad deposited something of a whitishcolour.

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