410 Conchisions 



hitherto studied. In addition to these, various authors have obtained 

 precipitins for the albumin of yeasts, of higher plants (I have grouped 

 these together as "Phytoprccipitins" in contradistinction to the following 

 " Zooprecipitins "), for the casein of different milks (lactosera), also for 

 different bloods, etc. 



To avoid needless repetition, I will refer the reader to pages 156 to 

 160, where the results of other authors with lactosera are given. The 

 results of tests with different precipitating antisera are summarized on 

 pp. 214, 335, 353, 359, 361, 403. The general bearing of the investiga- 

 tion from a zoological point of view is considered in the Introduction. 



In Part II, Section IX., pp. 381 — 407, evidence of the value of the 

 precipitin reaction in legal-medicine, based upon the work of various 

 authors, is given. 



In conclusion I would add that this investigation must necessarily 

 be regarded as preliminary in character. The exhaustive treatment 

 which our present knowledge of the precipitins has received, should 

 prove of use to others, and I hope that the work done will stimulate 

 many to further investigate the many problems which present them- 

 selves. Like other lines of investigation, this one appeared relatively 

 simple at first ; it is evident however now that the phenomena of 

 precipitation are of an exceedingly complex nature. 



i 



