( 71 J 
j>laces in a vurtts^ f everal of the Animalcules ml^t there 
be fed. 
, I anfwer, it may happen to thefe Animalcules^ as it does 
to Seven or Eight iS^^^j- put into a fmall hole of the ground; 
that Seed which puts outthe biggeft and ftrongeft Root, 
ftarves all the reft:> and becomes a Tree. 
It may be asked me again, why I make the Animalcules 
found in the Seed of feveral Animals to be of fuch different 
Sizes:, comparatively to the Animals they belong to t^^?'^. in 
the fpace of a fmall Sand in the Seed of a Cock^^oooo. in the 
Row ofa Cod'-fii/hioooo. in the Row of a 1^ (which fi(h 
is a loco times lefs than a Cod-fifh) the Animalcules as big 
as the others. Whereas it feems reafonable that th^ Animal* 
cules ought to be in bignefs to one another^ as the Creatures 
inwhich they are found;from whence it would follovvr, that 
thofe Animalcules which are in infers, would never be ca» 
pable of being dilcovered, becaufe of their exceeding 
fmallnefs. 
I anfwer that we muftfatisfy our felvesin thefe things 
as wellaswecan^ for/not to f^tdkoiz Coco Nut) 2l great 
Wall-nut mth his green fliell weighs down a looo ^pple 
Tree Seedsi and yet the proportion between the Trees is 
not fo great. 
In myLetter of the Third of March \6%\\ defcribed the 
texture of a Flep and fip-mufcle* But have fince examined 
that of a Flea^ as judging that if I could find the fame Fi- 
lament^ I might be pofitive that the Mufcles of Animals are 
all of the fame make 5 haveing therefore feveral times fe- 
peratedandexpofed to View t\\zt Mufcle of theBreaft, 
whereto the Leg is partly faftned ; lobferved the fame- 
^ngdiJ^ Indentings in the Filaments^ that 1 had feen in 0- 
ther places. Some appeared to me thicker in the middle 
then at the ends as 2. Fig. i. ABCD EFGH is 
the Defcription of the Filament of a Flea broken out of the 
Breaft* from which I perceived the Filaments of this Infed 
to grow Tapering towards the ends, and lofe themfelves 
