HEALTHY HUMAN MILK. 51 



a brownish extract-like residue which, when dried, is perfectly 

 soluble in water, (with the exception of a little albumen,) and 

 forms a milky fluid. Everything that precipitates casein, coa- 

 gulates milk ; the mucous membrane of the stomach of an infant 

 a few days old, that has recently died, seems, from my obser- 

 vations, to coagulate woman's milk more perfectly than the 

 mucous membrane of the stomach of the calf. 1 The solid con- 

 stituents fluctuate between 8-60 and 13'86g. I shall now give 

 some analyses of milk : 1st, the average of fourteen analyses 

 made at different periods with the milk of the same woman ; 

 2d, the analysis of the milk of a woman aged 36 years ; 3d, the 

 analysis of the milk of a nurse aged 20 years ; 4th, the maxima, 

 and, 5th, the minima, of numerous analyses. 



An. 64. An. 65. 

 1. 2. 3. 4. 5. 



Water .... 883-6 894-0 898-0 914-0 861-4 



Solid constituents . . 116-4 106-0 102-0 138-6 86-0 



Butter . . . 25-3 38-0 28-8 54-0 8-0 



Casein . . . 34-3 34-0 32-0 45-2 19-6 



Sugar of milk and extractive matters 48-2 40-5 36-0 62-4 39-2 



Fixed salts . . .2-3 1-8 2-7 1-6 



The maximum table gives the highest amount of each indi- 

 vidual constituent, and the minimum the lowest that occurred 

 in the whole series of analyses. 



[Clemm has recently published the following analyses : 



The 4th day The 9th The 12th 



after delivery. ditto. ditto. 



Water .... 879-848 885-818 905-809 



Solid constituents . . . 120-152 114-182 94-191 



Butter .... 42-968 35-316 33-454 



Casein .... 35-333 36-912 29-111 



Sugar of milk and extractive matters . 41-135 42-979 31-537 



Salts . . . 2-095 1-691 1'939 



Two analyses of healthy human milk have been made by 

 L'Heretier. 2 He found : * 



1. 2. 



Water . . 867-8 870-6 



Solid constituents . . . 132-2 129-4 



Butter .... 42-5 52-0 



Casein . . . .11-7 9-5 



Sugar of milk . . . 74-0 63-4 



Salts . . . .4-0 4-5 



1 Die Frauenmilch, &c. p. 29. 2 Traite de Chimie Pathologique, p. 627. 



