530 



AN AMERICAN TEXT-BOOK OF PHYSIOLOGY. 



icterus with arseniuretted hydrogen, similar iron compounds are noted in the liver, being 

 cleavage products of haemoglobin in its transformation to biliary coloring matter. The 

 amount of iron normally excreted from the body is far less than the corresponding biliary 

 coloring matter (see Haemochromogen), showing that the rest of* the iron is retained for 

 further use in constructing new haemoglobin. After extirpation of the spleen the amount 

 of coloring matter in the bile may decrease more than one-half, indicating that biliary 

 coloring matter is normally formed in the spleen through the destruction of haemoglobin, 

 and is carried by the portal vein to the liver. 1 



Iron is excreted as phosphate in the gastric juice, in bile (in considerable quantity), and, 

 according to MacaUum," in the intestinal juice. In the urine it is present as an unknown 

 organic compound. 



A newborn child or animal lias, proportionately to its weight, far more iron than at any 

 other time of its life. This iron is lost only very slowly, hence the very small quantity of 

 iron in the milk answers all necessities. The other salts of the milk are in the same pro- 

 portion to one another as are the salts in the newborn animal. 



Tables representing generally accepted analyses of the mineral constituents of the more 

 important fluids and cells of the body are subjoined. Only very pronounced differences 

 are to be taken into consideration in drawing conclusions, for analyses of animals of dif- 

 ferent species, or of the same species, or even of the same animal at different times, show 

 wide variations. The tables represent parts in 1000 of fresh substance : 



II. 



Blood-serum 7 (dog) . . 



I'.l 1-corpuscles* (pig) 



Blood-serum 8 (pig) • • 



Muscle ,J i<>.\ 1 



Milkio(cow) 



P 2 6 . 



0.489 

 2.067 

 0.188 

 4.644 

 1.60 



1 Pugliese: Archiv fur Phydologie, 1899, S. 80. 2 Op. cit., p. 278. 



:t Ilerter: Hoppe-Sevler's Physiologische Chemie, S. 192. 



4 Kroger : Quoted by Halliburton, Chemistry, Physiological and Pathological, p. 656. 



5 Bidder and Schmidt: Quoted by Halliburton, Op. cit., p. 638. 

 ' Boppe-Seyler : Physiologische Chemie, S. 302. 



7 Bunge : Bid., 3d ed., S. 265. 



8 Op. rit., S. 222. For other similar blood analyses, see Abderhalden, Zeitschrift fur 

 physiologische Chemie, 1898, Bd. 2-"), S. 65. 



9 Bunge : Ibid., 1885, Bd. 9, S. 60. 



10 Bunge : Physiologische Chemie, 3d ed., S. 100. 



