464 M E M O IK S of the 
tube cannot remain of the lame magnitude or expan/ion but 
changes every moment, for you cannot fo much as touch the tube 
with your hand, breath, or any part of the body that is a little 
warmer than the air, wherein the tube is, but the air in the tube 
h alfo expanded, fo as to put the water into motion, which is 
forced from D to A, altho'we perceive no motion with the naked 
eye 5 now, as theleaffc warmth expands the air included in the lel- 
lertubc, lb the warmth is alfolbon over, and the water receives 
another motion from C to B 5 in this water there were two of the 
faid fmall globules, of the largeft fort, in each of which were 
included five fmaller globules, pretty well grown in bignefsj 
and in a third large particle lay leven lefler round ones which 
were incomparably fmall 5 four days after, the faid particles had 
been put into the tube M. Leei^^^efihoek law that the outer pellicle 
of two of them, which was exceeding thin and trani'parent, was 
broke in pieces j and that the ten particles included in the two 
great ones were, by the motion of the water, moved from one 
ifide to the other 5 he further obferved, that, after the expiration 
of five days, the fmall particles included in the third great par- 
ticle, were not only increafed in bignels, but he could alfb dif- 
cern that from the infide of the fmall particles proceeded other 
round ones 5 after the expiration of five days more, the 
third round particle was alio a little broke open, and the parti- 
cles that lay therein were alio got out ; and altho' it was open on 
one fide, yet it turned round in the water, as nimbly as ever it 
had done before ^ fome days after, M. LeeiJOenhoek could not dil- 
cern any but fmall particles, whereof the great one confifted, 
which alio vanifhed in a little time 5 he never mifled a day, but 
he looked upon the fmall particles that came out of the greater 
one, and obferved that they not only increafed in bignels, but 
that the inclofed particles alio grew bigger: In the latter end of 
Sept ember y M. LeeiJcenhoek perceived that the included particles 
were not lb exactly round, as the great ones that incloled them; 
and alio that fome of them were protuberant, and that the laft 
particles that came out of the great ones, not being round, lay 
againft the fide of the glafs without any motion 5 now the lalt 
greater particles, when they were difcharged of their inclofed 
ones, or broken in pieces, were about four times lels than thofe 
that came out of them ; wherefore he concluded that either they 
had not their full growth, or not their full food ^ he alio obferved, 
that the faid round prirticles were of an equal weight with the 
water, lb that by the leaf! motion the water received from the air, 
they were alio put into motion: hi Fig. 21. E F reprefents one 
