^.j I'KlilACK 



associiiti'd wilh iiir for jcars, aiul «liil a large amount of work upon the |m'scnl 

 rt'scarclt ; iu«li-i'tl, nl one tinif, it was propost-d lliat tlic papi-r should appear uiidrr 

 our joint nanus. C'ircumstauct's, iiowt'vcr, led tlic doctor uway Ironi riiiladclpliia, 

 and his work was gentTously placctl at my disposal, lie certainly perfornud some 

 luuulr(>ds of hours' labor as luy assistant, and was of much service in the discus- 

 sion of phtns and nu-thods. In only one e.xperiuu-nt, however, reported in the 

 Menu>ir did I not mvself lake part, and almost all of the final thermometrical 

 readings were nuule liy myself, except in the case of the fever expurinients, when 1 

 usually allowed my assistants to carry on the work through the alternate nights. 

 Most of this night-work was personally superintended hy Dr. Lautenbach, although 

 I am under oldigations to Drs. (i. Evans .Vbbot, Jno. Marshall, Edward T. Reichcrt, 

 \V \V. Ja-'irard. and others for aid, without which the research could never have 

 reached completion, .\lmost all of the calculations were origijially made by myself, 

 but were revised, and indeed recalculated by Mr T. D Dunn and Dr. W . \N . 

 Jaggnrd. The few carbonic acid examiuatious repoilcd were made by Drs. Abbott 

 and Marshall. 



