SEPARATOR SLIME. 415 



identified. Other portions of the vegetable matter have the 

 cell walls considerably disintegrated ; these have probably passed 

 through the alimentary tract of the cow, and indicate the presence 

 of cow-dung. 



3. Substances derived from the cow ; hairs are often found ; 

 much epithelium from the udder of the cow, and possibly also 

 from the hands of the milkers ; and empty sacs (gland cells), 

 which form a very large portion of the slime. (If the cow was 

 in ill-health, mucus, blood, and pus may be present.) 



Micro-organisms are very numerous ; should the cows be 

 afflicted with tuberculosis of the udder, Bacillus tuberculosis 

 may be found here. 



The following composition is assigned to separator slime by 

 the author and by Fleischmann, respectively : 



Author. Fleischmann. Author. 



Per cent. Per cent. Per cent. (Hot). 



Water, . . . .66-24 67-3 72-3 



Fat, .... 0-50 1-1 3-1 



Casein (or analogous body), 22 (approx.) 25-9 18-1 



Milk-sugar, . . .0-51 , , 

 Other organic matter, . 7-75 j~ 



Ash, .... 3-01 3-6 2-5 



It appears remarkable that when milk is separated at about 

 160 F. the slime contains more water than when separated 

 cold. The ash, however, has practically the same composition. 



It is doubtful whether the substance returned as casein is 

 wholly this body ; it is undoubtedly a mixture of several pro- 

 teins, including Storch's mucoid protein. 



The following is the composition of the ash : 



Total ash 3-01 percent. 



Soluble ash, 0-166 



Insoluble ash . 2-844 



consisting of 



Silica, . . . . . . . 0-171 per cent. 



Iron oxide and alumina, . . . .0-012 



Lime, 0-654 



Magnesia, 0-225 



Alkalies, 0-559 



Phosphoric anhydride, .... 1-233 



There are 0-675 equivalent of lime and 0-325 equivalent of 

 magnesia to 1-506 equivalents of phosphoric anhydride, showing 

 that the insoluble ash consists chiefly of (Ca. Mg) (Na, K) P0 4 

 like the insoluble ash of milk. 



The quantity of separator slime averages about 0-032 part to 

 100 parts of milk separated, and varies within comparatively 



