506 PHILOSOPHICAL TRANSACTIONS. [aNNO I67O. 



mitted return of it, we kept him there about 48 hours, during all which time 

 he continued alive, but appeared somewhat swelled in his belly; his under-chop 

 moving the very first night, but not the day and night following. By opening 

 the receiver at length under water, we perceived that about half the air had 

 been drawn out. As soon as the water was impelled into the glass, the animal 

 that was before dull and torpid, seemed by very nimble and extravagant mo- 

 tions to be strangely revived. 



Exp. II. — ^We took a leech of the usual size, or somewhat short of it, and 

 having included it, together with some water, in a portable receiver, guessed 

 capable of holding about 10 or 12 ounces of that liquor ; the air was pumped 

 out after the usual manner, and the receiver being removed to a light place, 

 we observed, as we expected, that the leech keeping herself under water, there 

 emerged from divers parts of her body store of bubbles, some of them in a 

 dispersed way, but others in rows or files, if I may so speak, that seemed to come 

 from determinate points. Though this production of bubbles lasted a pretty 

 while, yet the leech did not seem to be very much discomposed by her present 

 condition. This done, we disposed of the receiver, which was well secured 

 from the ingress of the outward air, into a quiet place, where we daily visited 

 it once at least, or oftener, as there was occasion ; and found the leech somewhat 

 fastened by her tail to that part of the glass that was under water, and some- 

 times wandering about that part which was quite above water ; and still, when 

 we endeavoured to excite her, she quickly manifested herself to be alive : and 

 indeed (which will be thought strange) appeared so lively after the full expira- 

 tion of five natural days, that expecting something might have happened to 

 the receiver, and thereupon resolving to try how staunch it had continued, I 

 opened it under water, by which means the outward air impelled in so much of 

 that liquor, that I was satisfied the receiver was immediately before as well ex- 

 hausted as others are wont to be in our pneumatical experiments. 



The Eighteenth Title. 

 Of what happened to some Creeping Insects in our Vacuum. 



Exp. I. — ^We took five or six caterpillars of the same sort ; but I could not 

 tell to what ultimate species the writers about insects referred them. These 

 being put into a separate receiver of a moderate size, had the air drawn away 

 from them, and carefully kept from returning. But notwithstanding this de- 

 privation of air, I found them, about an hour after, moving to and fro in the 

 receiver ; and even above two hours after that, I could, by shaking the vessel, 

 excite in them some motions, that I did not suspect to be convulsive. But 



