DIGESTION IN THE MOUTH. 



271 



When placed on the warm stage of the microscope they may often be 

 seen to be the seat of amoeboid movement, and to contain numerous 

 granules which exhibit the Brownian movement. 



The chemical composition of the mixed saliva varies somewhat in 

 different animals. The solids are epithelium and mucin, ptyalin, serum- 

 albumen and globulin, and salts. The following table represents some 

 of the different analyses which have been made of this secretion in 

 different domestic animals. According to Lassaigne, mixed saliva con- 

 tains as follows : — 



Horse. 



Water, 992.00 



Mucus and albumen 2.00 



Alkaline carbonates 1.08 



Alkaline chlorides 4.92 



Alkaline phosphates and phosphate of lime, . . traces. 



Cow. 

 Water, 



Mucus and albumen, 

 Alkaline carbonates, 

 Alkaline chlorides, 

 Alkaline phosphates, 

 Phosphate of lime, 



1000.00 

 Sheep. 



Water 989.00 



Mucus and albumen, 1-00 



Alkaline carbonates, 3.00 



Alkaline phosphates, 1-00 



Alkaline chlorides, 6.00 



Phosphate of lime, traces. 



1000.00 



990.74 



0.44 



338 00 



2.85 



2.49 



0.10 



1000 00 



Man. 



Water, 



Solids 



Mucus and epithelium, 

 Soluble organic matter, 

 Sulpho-cyanide of potassium, 



995.16 

 4.84 

 1.62 

 1.34 

 0.06 



Inorganic salts, 1-82 



Bog. 



Water, 989.6 



Solids 10.3 



Soluble organic matter, 3.58 



Inorganic salts, . . .' 6.79 



The following represents the quantitative composition of the ash 

 of the saliva of man and the dog (Jacubowitsch) : — 



Man. 



Salts 1.82 



Phosphoric acid 0.51 i 



Sodium 0.43| 



Lime, 0.03 < 



Magnesium 0.01 ' 



Alkaline chlorides, 0.84 



Dog. 

 6.79 



0.82 



0.15 



5.82 



