( 170 ) 
of necefTity muft become more denfe. But to proceed ; I 
c-aus’d iome Water to be heated about Blood- wrrm,, 
when weighing my Bottle in it^ I found the bulk of Wa- 
ter equal to the bulk of the Bottle was about j Grains 
lefs than when Cold ; which fbows, that the component 
Parts of the Water are eafilyfeparaced by Heat, and the 
Matter lodg’d in its In terftices capable or dilation. Then 
I took that Water that I had purg’d of all its Air, (as 
•near as 1 could,) and gave it a degree of Heat, not ex- 
ceeding luke-warm ; upon weighing the premention'd 
Bottle in it, I found, that altho’ the Heat it had recei- 
ved was very inconfiderable, yet the bulk of the Wa- 
ter in that State, equal to that of the Bottle, was now 
deminifh’d 2 Grains: which plainly fhews, that not- 
•withftanding the Water contain’d no Air that I could 
’ difcover, yet there feems a Matter latent in it, capable 
of Intumefcence. 
V. Eplftola Guidonis Grandi, Societatis 
gaits Londin. Socii, ad llluft. Comitem D. Lau* 
rentium Magalocti, dt&^ie Societatis Socium^ De 
Matura O* ^roprietatibus Soni. 
Clariffimo Viro Laiirentio Magalotti 
Guido Grandus S. 
E LegantilTimum Pr^efulis Armachani commentario- 
lum de Sono, quod mihi nuper communicafti, 
-fumma animi voluptate perlegi 5 at circa Semiplani figur 
ram in calce ejus fcripti comniemoratam, in cujus potil- 
fi»ium expofitione meam a te operam defiderari figni- 
