522 APPENDIX. 



After feeding, for the space of a fortnight, on horseflesh 

 alone, the milk yielded : 



Water .... 77-14 



Solid constituents . . . 22-86 



Butter 7-32 



Casein 



Extractive matter 

 Soluble salts 

 Insoluble salts 



11-15 

 3-39 

 0-45 

 0-57 



Not a trace of sugar could be detected in the latter specimen. 

 His other analyses are merely confirmatory of the same fact. 



Dumas believes that the milk-globules are surrounded by a 

 caseous investment; he found that if milk be shaken with pure 

 ether, the two liquids which are at first mixed, separate on 

 standing, and the milk preserves its ordinary appearance, 

 whilst the ether dissolves scarcely anything. If, however, acetic 

 acid is added to the milk, and the mixture is boiled, the whole 

 of the butter may be removed by subsequent agitation with 

 ether, and the milk ceases to be opalescent. 



PAGE 119. Colouring matters of urine. Heller has re- 

 cently published some observations on certain new colouring 

 matters in the urine. He believes that there exists a yellow 

 pigment (uroxanthin) which occurs in solution in very small 

 proportion in healthy urine, but is much increased in certain 

 forms of disease. It possesses the property of being converted 

 by oxidation (either spontaneously or artificially) into two other 

 pigments, one of which is of a ruby-red tint, (urrhodin,) while 

 the other is of the colour of ultramarine, (uroglaucin.) 



These are both insoluble in the urine, and being deposited, 

 form a purple or violet-coloured sediment. 



That uroxanthin and its products are derived from urea 

 seems probable, from the circumstance that uroglaucin and 

 urrhodin occur in diseases different in most of their characters, 

 but similar in one the presence of an excess of urea in the 

 blood: thus they are found in Bright' s disease, in cholera, and in 

 suppression of urine. Further, when these products occur in 

 considerable quantity, (especially when the blue sediment is 

 spontaneously formed,) there is always much carbonate of am- 

 monia, and very little urea (perhaps mere traces) in the urine, 

 as is often the case in Bright' s disease. Finally, Heller has 



