eometo be cleggMm their motion , Whence it feem’dreafonaMe to espeft 
that upon the Reunion of the Saline panicles into fuch a Body as they had 
commuted before.the redintegrated Sal Armoniack having, neer upon the 
fame Texture, would, upon its being rediffolv’d, produce the fame or a not 
much inferior degree of Coldnefs ; And hereupon , though I well encash 
forefaw that an Armoniack folution, being boyl'd up in .Earthen velTels (for 
©lass ones are too chargeable) would,by piercing them-, both iofe fome of 
the more fubtle parts, and thereby fomewhat impaire the texture of the reft 
yet I was noedeceiv’din Expefting, that the drySait, remaining in the pin! 
kins.bemg redilfolv d in a due proportion of water ,would very confiderabftr 
infngtdate it^as may further appear by theNotes.which for your greater fatif- 
faftion you will find here fubjoyn’d-as foon as 1 have told yon. That thoueh 
for want of other velTels I was firft reduc’d to make ufe of Earthen ones and 
the rather, becaufe fome Metalltn VefTels will be injur’d by the difiblv’d 
Sal Armoniack if it be boyl’ddn them 5 yet I afterwards found fome conveni- 
encies in V effels of other Mettall,as of Iron ; whereof you may command a 
farther Account, J 
March the :. 2 ptb ( th* Thermofcope in the Airwas at 82 inches • being nut 
mtoa fomewhat large evaporating glafs, fill’d with water , it fell (after it 
tod a pretty while, and had been agitated in the liquor) to 8. inches : then 
half die Salt,or lefs,that had been ufed twice before, and felt much left’ 
cold than the water, being put in and ftirrM about.the tinfted Spirit fubfided 
wtthavifibleprogrefs, till it was fain manifeftly beneath 4. inches ■ and then 
having caufed fome water to be frefhly pump’d and brought in , t’hough the 
newly mentton dSolut.on were mat with it, yet it prefently made the Spirit 
hlvYexpSed^J t0 afcend m thcIn!lrument ’ mudl t^n one would 
And thus much may fuffice for this time concerning our Frmrifick Expe- 
riment ; which I fare. I doubt but the Cmefi„s will lay hold L as veryft- 
r 0U ,w^ t0 . fome ® f . thelr ,T en . ents i which you will eafily believe ic J mt 
.hJ he nnSh ! 3 0n ’<-^ 1 have ofewhere oppos’d , of thofe Modern Phil’ofophers 
that would have Salt-petre to be the Primum Frindnm-t though I found bv 
If rnM at r h Wh ‘ 't gives a much confiderfbler degree 
®, , C ° d > * an Gthel T 1 [ e '),, ? Q t about the Reflexions, that may be made on 
this Experiment, and the Variations, and Improvements, &Ufes of it though 
I have dtvets things lying by me -, yet.fince you have feen feveral of them al- 
ready, and may command a fight of the reft, I {hall forbear the mention of 
them here,not thinking tt proper, tofwell the bulk of this Letter with them 
An Account of two Beo^s lately printed in London 
lE VCZ JDIS ELEME NT'A GEOMET R1C Axm 
mdme m mthtdo demmftrata In this compendious and pretty Edition the 
Anonymous Author pretends to have rendred thefe Elements more expedt- 
ttous; by bringing all togetherinto one place, what belongs, to one and the 
famefubjetft: Comprtfing t.what Emlid hath faid of L.W Streight, In. 
terfeamg one another and parallel, a. what he hath demonftrated of a 
a Triangle .and of Triangles Compared one with another. 3 What of 
otorWe “< whW) 4 W i 3t 0f *§•”**« in Triangles and 
®thet figures*. j , What of Quadrats and Em*»glei, made of Lines diyetfly 
