224 Mifcetlaneous ObfervafioHs on Balts > &c s 
Time, formed in this Way, upon Windows* 
on wooden Pales, and fometimes on the Webs 
of Spiders, very elegant Reprefen tat ions in 
Miniature of Landfcapes, with Groves of 
Trees, and a feeming Variety of Shrubs and 
Herbs : but the moft charming of this Kind 
I ever beheld ufed to be on the Glafs Win¬ 
dows of a neceffary Houfe in the Country* 
owing I fuppofe to the additional Inter¬ 
mixture of animal Salts., 
Copper Plates are very expenfive, and De« 
fcriptions without them hardly intelligible* 
or I fhould have added many curious Ob- 
fervations made on Mixtures of animal, ve^ 
getable, and mineral Salts (fome of which 
are in very few * Hands) as alfo on the So- 
lutions of different Metals and Minerals by 
acid Spirits * but thofe who know any thing 
of Chemiftry, or will beftow a little Time in 
the Study of Nature, will, I am perfuaded, 
in Confequenc'e of the Hints here given, fug¬ 
ged; to themfelves numberlefs Experiments* 
which if purfued may prove both profitable 
and pieafarit. 
In fhort, Salts are the aCdve Principles 
whereby Nature performs Wonders 5 as is 
* Particularly the Matron of Egypt, brought thence and 
given me by Dr. Pocock } an alkaline Salt fermenting violently 
with Vinegar (whofe Shootings are very Angular) from Sindy 
in the Inland Parts of Afia , given me by Sir Hans Slbane ; the 
genuine Salts of mineral Springs in different Parts of the World ; 
and many other /aline. Subfiances either in their natural State, 
<?r by human Art extracted or compounded. 
fuficiently 
