f,i> THE SECRETIONS: 



Haidlen, 1 by the method already noticed, found that 1000 

 parts of woman's milk contained : 



i. 2. 



Butter % . 13 34 



Casein and insoluble salts . 27 31 



Sugar of milk and soluble salts . 32 43 



In the second analysis, the milk was extremely rich in solid 

 constituents.] 



Meggenhofen 2 has also analysed woman's milk ; but, from 

 the method which he pursued, we can place no reliance on the 

 determination of the individual constituents. The dried resi- 

 due was extracted with alcohol of 0'83, and afterwards with 

 water, as long as any additional matter was taken up. It is 

 evident that fat, some of the sugar, and perhaps even traces of 

 casein must be contained in the alcohol-extract; the water- 

 extract contains the rest of the sugar, some extractive matter, 

 and a great part of the casein. According to Meggenhofen, 

 the solid constituents in woman's milk vary from 10 to 12*56, 

 and the salts from 1*2 to 2'4g. These numbers correspond 

 very closely with my results. 



The analyses gave in 1000 parts : 



Water . . . . 827-5 883-5 789-3 



Solid constituents . . . 172-5 116-5 2107 



Fat with sugar and alcohol-extract . 91-3 88-1 171-2 



Sugar and casein . . .11-4 12-9 8-8 



Coagulated casein . . . 24-1 14-7 28-8 



Payen 3 has likewise analysed woman's milk, but his results, 

 especially regarding the amount of casein, differ so very much 

 from those of other chemists that they can only be explained 

 on the assumption that there was an error in the plan of his 

 analysis. The following numbers represent the mean of three 

 analyses; water, 857*7; solid constituents, 142*3; butter, 

 51*5; casein, 2*2; residue of evaporated whey, 78*0. 



1 Annalen der Chemie und Pharmacie, vol. 45, No. 3. 



2 Dissert, inaug. sistens indigationem lact. mul. chemic. auct. Meggenhofen. 

 Frankf. a. M. 1826. 



3 Journal de Chim. med. vol. iv, p. 118. 



