Experiments on Bats deprived of Sight. 139 



companion, which it afterwards followed wherever it Hew. 

 Of what ufe then is fight to the bat, and what is the organ 

 that fupplies its place ? 



. The author then imagined that the folution of this pro- 

 blem could be found only by anatomical refearches. During 

 the courfe of thefe, he found the organ of hearing very great 

 in proportion to that of other animals, and a considerable 

 nervous apparatus affigned to that part. The upper jaw alfa 

 is furnifhed with very large nerves, which are expanded in a 

 tifiue on the muzzle. 



M. Jurinc then extended his experiments to the organ of 

 hearing and that of fmell. Having put a fmall hood on a 

 long-eared bat, it immediately pulled it off, and flew. He 

 flopped up its ears with cotton, but it freed itfelf in the like 

 manner from that inconvenience. He then put into its ears 

 a maftic of turpentine and wax. During the operation the 

 animal (hewed a great deal of impatience, and flew after- 

 wards very imperfectly. 



A lono-eared bat, the cars of which had been bound up, 

 flew very badly : but this did not arife from any pain occa- 

 fioned by the ligature ; for, when its ears were fewed up, it 

 flew exceeding well. In all probability the animal would 

 have preferred having its ears bound up to having them 

 fewed. Sometimes it flew towards the ceiling, extending its 

 muzzle before it fettled. 



M. Jurine poured liquid pomatum into the ears of a bat 

 which enjoyed the ufe of its fight. It appeared to be much 

 affeded by this operation ; but when the fubftance was re- 

 moved, it took flight. Its ears were again filled, and its eyes 

 were taken out ; but it flew then only in an irregular man- 

 ner, without any certain or fixed direction. 



The ears of a horfe-fhoe bat, which had the ufe of its fight, 

 were filled with tinder mixed with water. It was uneafy 

 under the operation, and appeared afterwards reftlefs and 

 ftunnedj but it conduced itfelf tolerably well. On being 

 -blinded, it rufhed with its head againft the ceiling, beat the 



ozier 



