PREFACE. 



r niIK following Appendix has been written upon tin- same 

 * lines us in t'onner editions, save that it has been enla 

 ami in reality now eon>titutes a treatise on the chemical sub- 

 stances occurring in the animal body. As in former editions 



ntirely the work of Dr. A. Sheridan I. 

 The references given, though extensive, are not intended to 

 .liaiistive. An effort has been mad"- to make tin- ivfcr- 



:it work as complete as possible : other i 



are to pajiers which themselves give full i-efereiices and will 

 therefore serve as a guide t<> the literature of the subject ; 

 and some have been inserted in order to inform the student 

 of the dates at which important results \\ere iirst descrii 



\Ve desire to express our thanks to .Messrs. Wintei 

 Heidelberg for the six figures which have been taken from 

 Krukenbei-'/s Gfrundriu der /// //////>. y,-,-/,, ////>//- n 

 an<l t") rrofosor Kiihne for the large number which ha\e 

 taken from his Li-ln-inn-li ,/,/ phyiiologitchen ('I' 1^68). 



A few have liei-u drawn in wood from the plates in Fii: 



. I////* ./,/ physiologitchen Chemie (1858). 



\Ve are also indebted to Dr. S. K'uhcmann for reailing the 

 proots from pa-jv !1 to page ^lo', in which tin- t"'\t contains 

 many formula 1 , and involves special chemical knowle.: 



The volume is paged separately from the rest of the T 

 Uook. and has an index of its own. Indeed it ma\ he regarded 

 as an independent work. The reference! to the body oi the 

 Te\t-l!ook are -iven in paragraphs. 



M. l-o-l I i;. 



A BHEBIDAK i.i \ 



July, is: i-.'. 



