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miftry s whichiaihat there is ao Acid Spirit y uoiverfally dif- 
fafed through the world, which giveth folidity not only to 
Bones, but alfo Minerals and Mcttals, and to all Vegetables^ 
penetrating all, fixing all, and being the Father of the Hard- 
nefi and Solidity in all bodies. 
Fig' IX. reprefents a Child of fix weeks after Conception i 
where it is to be noted, that comparing together the Bones of 
divers fostus*s it will be fouod, perhaps to admiration, that 
that which have been conceived but a little time after ao o- 
ther, hath yet the bones in proportion twice asbig^ That 
which is here exhibited by FigJX»appears much kffer than an 
other of two months, as appears in my Book o£ thQCe^erati- 
on of Boms j but the Bones are for all that no kfs remarqua- 
b!e ,* for whatever hath the hardnefs and confiftence of 
Bones in thaty hath already the nature of Cartilages in this* 
The iafcrtor jaw-bone ismoft obfervable in this Child of 6. 
weeks, marked A, it being at this age compofed of fixlictle 
bones^. which when it is born are all joyncd together, and 
make but one<. 
If it be asked, How I come to know , that thcfe degrees of 
growth come to pafs exaftly within thofe times recited 5 e< 
fpccially fincc in abortions we often fee Embrios of 4 moneths 
and abovCithat arc not fo big as thofe fpoken of? I might an- 
fwer by repeating all I faid before, when I compared the pro- 
portions of thofe different Germes.To whichlfliall only add, 
that Embrios which mifearry have often remained a lon|; while 
in the Body before they came forth , or have lii^ed there fo 
fickly as not to draw perhaps half the nourifhment , neceflSry 
for them 5 and therefore much lefs than elfe they would 
be. 
So far Ksrh^i^gius on whofe difeourfe are madethefe Re- 
flexions by Monfieur De^/, 
I . That thofe Eggs are generated in Fsminarum fefllcMUs^ 
and thence made todefcend per tubam into the matrix, i^^ co- 
itu^ per vim Jpirituofam fminis majculi per uteri tubam 
penetrantis^ 
a* That thofe Eggs are of different bigncfli s 5 fince thofe 
of the third Fig. repreftnt one according to the life^ as it 
Nnnn \^as 
