TOL. v.] PHILOSOPHICAL TRANSACTIONS. 477 



cracked out, and was mended with a cloth dipt in cement, yet at the end of 

 the half hour, the weight of the outward air suddenly beat it in, and thereby 

 brought the imprisoned frog a reprieve, which hindered us from bringing the 

 experiment to an issue. 



Exp. IF'. — Sept. 11. Wc took a small frog, and having conveyed her into 

 a very small portable receiver, began to pump out the air. At first she was 

 lively enough, but when the air was considerably withdrawn, she appeared to 

 be very much disquieted, leaping sometimes after an odd manner, as it were to 

 get out of the uneasy prison, but yet not so, but that after the operation was 

 ended, and the receiver taken off, the frog was perfectly alive, and continued 

 to appear so near an hour, though the abdomen was very much, and the 

 throat somewhat extended ; this latter part having also left that wonted panting 

 motion, that is supposed to argue and accompany the respiration of frogs. 

 At the end of about 34- hours, after the removal of the receiver from the 

 pump, the air was let in ; whereupon the abdomen, which by that time was 

 strangely swelled, did not only subside, but seemed to have a great cavity in 

 it, as the throat also proportionably had ; which cavities continued, the frog 

 being gone past all recovery. 



Exp. V. — April 14. A large frog was conveyed into a plated receiver, and 

 the air being withdrawn, her body by degrees was distended ; as appeared, 

 when by a casual springing of a leak, the air got in again, and made her look 

 much more lank and hollow than ever. The receiver with the gage were kept 

 under water near seven hours, because I was obliged to stay long abroad ; at 

 the end of which coming home I found the receiver staunch, but the frog 

 dead and exceedingly s\('elled : upon the letting in of the air, she became more 

 hollow and lank than ever. 



N. B. I have purposely, both under this title and some others, subjoined 

 some trials, whose events are not altogether such as others, recited under the 

 same head, would invite one to expect ; but I purposely do it, not only to be 

 true to the impartiality I proposed to myself in writing these narratives, but to 

 awaken the curious to consider and observe what variety of phaenomena, in 

 such trials, may be attributed to the season of the year wherein they are made; 

 and to the strength, bulk, age, peculiar constitutions, &c. that relate to the 

 respective animal on which the experiments are made ; besides, what things 

 may on other accounts be fit to be also considered. 



The Fourth Title. 

 Of the PJurnomena afforded by a newly kittened Kitting in the Exhausted Receiver, 

 Being desirous to try whether animals, that had lately been accustomed to 



