102 SCIENCE PROGRESS. 



cures chlorosis ; (3) bismuth, manganese and other drugs 

 which are just as capable as iron of combining with 

 hydrogen sulphide, do not cure chlorosis. 



In reference to animal pigments, other than those 

 contained in blood, the only paper worth mentioning is 

 that by Prof. Church (Proc. Roy. Soc, li. 399) on the 

 peculiar copper-containing pigment found in the feathers 

 of certain birds, and to which he has given the name 

 turacin. 



Urine. — A good many references have already been 

 made to papers in which a consideration of the urine 

 forms part. Those which have not been already men- 

 tioned are the following : — 



"The Work of the Kidney," by W. H. Thompson 

 (Brit. Med. Jour., 1893, u - 681); the experiments made 

 on dogs, in which the urine was collected after the intra- 

 venous administration of atropine and morphine, showed 

 a diminution of secretion which could not be explained 

 by interference with blood pressure ; this, taken with the 

 fact that heat is produced in the kidney during its work, 

 tends to the belief that some of the urea is formed in the 

 kidney itself, and that this process of true secretion is 

 lessened by drugs which produce similar effects in other 

 glands. 



" Fcetal Urine," by L. A. Helme {ibid., 1893, 1261) ; 

 a small quantity accidentally obtained during delivery was 

 found to contain urea (0*15 per cent.), creatinine and 

 chlorides, but no phosphates, sulphates, sugar, or albu- 

 min. Eight hours after birth, sugar, albumin, and 

 phosphates were absent, but sulphates, chlorides, creati- 

 nine (in larger amounts), and urea (0*3 per cent.) were 

 present. 



With regard to individual constituents of the urine the 

 following papers may be noted : " A quantitative study of 

 the phosphates of a horse's urine," by L. Liebermann 

 (Prliiger's Archiv, 1. 57) ; " On urobilin," by F. Grimm 

 (Yirchow's Archiv, cxxxii. 246), who finds this pigment 

 absent in fasting urine ; and by A. Eichholz (Joztr. Physiol., 

 xiv. 326), who regards hydrobilirubin as an intermediate 



