LECTURE IV 



177 



the administration of arsenic was iiniformlv 

 followed by profuse secretion of mucus and 

 watery liquors into the stomach, divides 

 the nerves of the eighth pair in dogs, and 

 then administers the poison, but no secre- 

 tions are afterwards effused into the sto- 

 mach. * 



Professor Harwood of Cambridge m.ves 

 to two dogs, equal in age, health, and ap- 

 petite, equal quantities of flesh meat. They 

 were pointers ; and he suffers one of the 

 dogs to do what nature indicated to be fa- 

 vourable to dio'estion, to lie down bv the 

 fire and go to sleep ; but he entices the 

 other into the fields, and causes him to 

 hunt about for game. After some hours 

 he kills both dogs, and finds the food in 

 the stomach of the doo* which had been 

 kept in constant exercise, undigested and 

 but little changed ; whilst in the other it 

 had, in the same time, not only been di- 

 gested by the stomach, but converted into 

 chyle by the intestines, and w^as rapidly 

 passing through their absorbent vessels 



* Philos. Trans. 1814. 



