$22 Birds ofPtty, — l T !Cgs 4 



8 nines towards the eafr, froma perpendicular direction, which 

 amounts exactly to as much as, according to his calculation, 

 is produced bv the diurnal motion of the earth. De la Place, 

 of Paris, difputes a part of this deviation, and, according to 

 his calculation, admits no more than five lines. This it' 

 adduced as a new proof of the rotatory motion of the earth. 



PHYSIOLOGY. 



Dr. Carradori, in a letter to INI. Lafti on the digeftion of 

 nocturnal birds of prey, considers it as fully eilablilhed that 

 thefe birds dig-eft vcoetables. It refults from his experi- 

 ments, that they can be fupported extremely well with that" 

 food, though it is repugnant to their nature. Dr. Carradori 

 has therefore deftroyed the erroneous opinion that the gaftric 

 juice of thefe animals had an affinity only for animal fub- 

 ltances: what he eftabliffics by his experiments, that carni- 

 vorous animals find nourifhment in the produce of plants, 

 was before rendered probable by the difcovery made by 

 Fourcroy of the cxiftence of gluten, albumen, and gelatinous 

 matter in vegetables. 



The fame author has afcertained, by new experiments, 

 that breathing is neceiiarv to aquatic frogs for the fupport oi 

 life. He obferved, that thefe animals held under water lived 

 a much longer time when the jars were open than when 

 they were ihut, and that their exiftence was prolonged in 

 proportion to the volume of the air around them. Under 

 water covered with a ftratum of oil they lived only a fiiort 

 time. In pure oil they died in the ccurfe of 40 minute?. 

 The author was defirous to try alio how far water was necef- 

 fary for fupporting the life of thefe animals. He obferved, that 

 frogs kept in water up to the belly died a third fooner than 

 thofe kept entirely dry. Fifli inclofcd in a jar partly filled 

 -with air, confumed none of that fluid. 



MEDICAL 



