VOL. XXll.] PHILOSOPHICAL TBAlSTSACTIONS. 479 



you cannot come near that tube with your hand, breath, or any part of the 

 body, that is a little warmer than the surrounding air, but the air in the tube is 

 also expanded, which puts the water into motion, and is forced from d to a, 

 although we perceive no motion with the naked eye. Now as the least warmth 

 expands the air included in the lesser tube, so the warmth is also soon over, and 

 the water receives another motion from c to b. 



In this water there were two of the said small round particles of the greatest 

 sort, in each of them were included 5 smaller round particles, which inclosed 

 particles were pretty well grown in size, and in a 3d large particle lay 7 lesser 

 round ones, which were incomparably small. Four days after the said particles 

 had been put into the tube, I saw that the outer pellicle of two of them, which 

 was exceedingly thin and transparent, was broke in pieces ; and that the 10 parti- 

 cles included in the two great ones, by the motion of the water moved from 

 one side to the other. I observed further, that after the expiration of 5 days, 

 the small particles included in the third great particle, were not only increased 

 in size, but I could also discern that from the inside of the small particles pro- 

 ceeded other round ones. After the expiration of 5 days more, the 3d round 

 particle was also a little broken open, and the particles that lay there in it were 

 also got out ; and although it was open at one side, yet it turned round in the 

 water, as nimbly as ever it had done before. 



Some days after I could not discern any, but only some small particles, of 

 which the great one consisted, which also vanished in a little time. I never 

 missed a day without looking on the small particles that came out of the greater 

 one, and observed that they not only increased in size, but that the inclosed 

 particles also grew larger. In the latter end of September, I perceived that the 

 inclosed particles were not so exactly round as the great ones that included them ; 

 and also that some of them were protuberant, and that the last particles that 

 came out of the great ones, not being round, lay against the side of the glass 

 without any motion. Now the last greater particles, when they were discharged 

 of their inclosed particles, or were broken in pieces, were about 4 times less 

 than those that came out of them ; wherefore I concluded that they had not 

 their full growth, or not their full food. I have also observed, that the said 

 round particles are of an equal weight with the water ; so that by the least mo- 

 tion the water received from the air, they were also put into motion. 



In fig. 2, EF shows one of the larger particles, with its enclosed ones, that 

 were increased so much in size that they were ready to be emitted, which lay more 

 regularly here than in any of the rest, where there was not the ordinary motion, 

 which made me believe that this was only caused by the inclosed particles not 

 lying all equally distant from their centre, and that these that lay farthest from 



