‘APPENDIX. 303 
34. The like Mixture in Vacuo^ made 
an Eftervefcence of long Continuance, its 
Heat increafing from forty fix \ to fixty 
Degrees. 
35^. A Dram of Tin dropped into Spirit 
of Nitre, did in an inftant make a mod fur- 
prizingly violent Eftervefcence, Co that the 
“ Heat increafed from forty fix i to two him- 
dred and fifty 5 the Fumes were fo great as 
to fill the whole Houfe, and fume out at 
the Door : The whole Tin was inftantly 
turned into a white dry Powder, refembling 
true Calx of Tin. This Experiment ought 
“ to be made with great Caution, left the 
Lungs be injured thereby. When Aqua- 
“ fortis and Tin were mixed the Heat was 
only from forty fix to a hundred and fixty 
three Degrees. 
36'. When a Dram of Tin was dropped 
into Spirit of Nitre in Vaetto^ there was 
alfo a violent Eftervefcence, tho’ not near Co 
great as the other, the Heat arofe from forty 
“ fix t to a hundred and eighty Degrees. Some 
“ of the volatile Fumes were elaftic, for the 
Mercury in the Gage fell two j Inches. 
37. Filings of Iron and Spirit of Nitre 
made a vaft frothy Efferv^cence, with large 
yellow 
