58 



Christena and others, are well known and have been sufficiently 

 discussed, that we may consider that our readers are sufficiently 

 acquainted with their drawbacks, consisting partly in very tedious 

 operations, partly in unreliable results. (See Fresenius' Zeit- 

 schrift, 1880 ; Petersen's Forschungen, 1879 ; Gerber und Raden- 

 • hausen's Yorschlaege zu einer einheitlichen Untersuchungsmethode 

 der Milch, Schweizer Wochenschrift f. Pharmacie, 1879.) The 

 method employed by the author is a modification of the one pro- 

 posed by Ritthausen for cows' milk. The albuminates of woman's 

 milk differ from those found in other milks, especially, also, 

 in their behavior to precipitants. A few c.c. of cupric sulphate 

 solution precipitate the albuminates in 10 c.c. of cows' milk easily 

 and completely, while in woman's milk but a part of the albumi- 

 nates can thus be coagulated. By a modification of the process, 

 however, complete coagulation can be obtained. To this end 

 it is necessary to neutralize the acid in the sulphate almost or 

 completely. Thus a fine flocculent precipitate is formed, which 

 contains the fat and all the albuminates. 



After a great many experiments the following method was 

 adopted : 



5 c.c. of woman's milk are diluted with 100 c.c. of distilled 

 water, and after mixing well 3 c.c. (sometimes, perhaps more) of 

 cupric sulphate solution are added, and then at once 2.5 to 3 c.c. 

 of the alkali solution (strength of the respective solutions as 

 given in the article on cows' milk). A precipitate is produced 

 which sinks easily to the bottom of the beaker. For its further 

 treatment we refer to the detailed description given in the chapter 

 on the " Chemical analysis of cows' milk," p. 24. 



The determination of the solids and ashes is made in 10 c.c. 

 of accurately weighed woman's milk. The particulars for the ex- 

 amination of this milk do not differ from those described in the 

 chapter on the " Analysis of cows' milk," to which we refer. 



The difference in the composition of the milk of wMte women 

 compared with that of women of the African race, has been 

 given by H. A. Mott, jr. According to his statement, the secretion 

 of the milk commences on the seventh or eighth day. The color 

 of this milk is yellowish-white, resembling cows' milk. It is richer 

 in solids than the milk of white women, and, on evaporation, 



