DIGESTION. 595 



Dr Stevens proved likewise by his experiments that the sto- 

 mach of certain animals the dog, for example, acted more 

 powerfully upon animal than on vegetable food. On the con- 

 trary, the stomach of the sheep and ox acted powerfully on ve- 

 getable food, while it produced no sensible alteration on animal 

 food. This will be evident from the following experiments : 

 I. The Dog. 



Food inclosed Hours in the Loss of 



in spherules. stomach. weight. 



17 parts raw beef, 4 5 parts. 



Do. raw cod, . 4 9 



Do. raw potato, . 4 3 



Do. raw cabbage, 4 1 



Do. roast mutton, 4 6 



Do. boiled turbot, 4 10 



Do. parsnep, . 4 



Do. boiled potato, 4 5 



The food was inclosed in perforated ivory spheres. The ivory 

 was obviously corroded. This induced Dr Stevens to make the 

 following experiments : 



17 boiled mutton, . 8 hours. All dissolved. 

 Do. fish, . Do. Do. 



Do. potato, . Do. 11 parts. 



Do. parsnep, . Do. 



The ivory balls in which these articles had been inclosed were 

 dissolved and had disappeared. He then made a dog swallow 

 three pieces of the thigh-bone of a sheep. In seven hours, 

 The 1st fragment lost 7 grains of its weight. 

 2d ... 9 



3d ... N 12 



In the following experiments made on the stomach of the dog 

 the articles of food tried were enclosed in perforated tin-cases, 

 which were not in the least acted on : 



Weight lost. 



17 parts roast beef, . 10 hours. All dissolved. 



Do. roast veal, . Do. . 10 parts. 



Do. tallow, . Do. 8 do. 



Do. wheat bread, Do. All dissolved. 



Do. roast mutton, 7 hours. Do. 



Do. roast lamb, Do. 1 parts. 



