218 LECTURE V. 



throw it out in a mixed state. He distin- 

 guishes in this class of animals between the 

 corporeal and pulmonary hearts, observing, 

 that the snail has a heart for the former 

 circulation and not for the latter. He par- 

 ticularly examined, and was thoroughly 

 acquainted with the circulating and respi- 

 ratory organs of the cuttle-iish, which are 

 displayed with his usual perspicuity and 

 accuracy, by preparations in the Museum, 

 and also by beautiful drawings, two of 

 which have been lately published in the 

 Philosophical Transactions for 1816, by Sir 

 Everard Home. 



As no one can doubt Mr. Hunter's know- 

 ledge of the circulation in fish and reptiles, 

 I shall say nothing on this subject, except 

 remarking, on account of the physiological 

 inference the fact admits of, that the fish 

 has only a pulmonary heart It is com- 

 posed of an auricle and ventricle, the for- 

 mer receives the blood returned from all 

 parts of the body, and the latter propels it 

 through the gills, where, having undergone 

 the change produced by respiration, it re- 



