[ 67 2 ] 
oppofed to each other. South t-o South; the Filings 
produced the fame Appearance of Rejiulfion, as de- 
fcribed in the fifth Experiment-, then the Bars being 
brought fo near as to touch each other at the fame 
Poles, the Repulfton was inftantly changed into At- 
traction. . 
III. A Difcourfe concerning the Ufefulnefs of 
Thermometers in Chemical Experiments ; 
and concerning the Principles on which 
the Thermometers now in Ufe have been 
conJlruEled ; together with the Defcription 
and Ufes of a Metalline Thermometer, 
newly invented by Cromwell Mortimer 
M. 2). Sec. R. S. &c. 
^ May 8 . 1735 , CHEMISTRY being the moft ex- 
here printed with jomem . {? 
Alterations . tenftve Brancn of Experimental 
Phiiofophy, hath luimifh’d Mankind with the greateft 
Number of curious and ufefui Difcoveries; for not 
only the Art of feparating Metals from their Ores, of 
which Metals are form’d fuch Variety of ufefui In- 
ftruments, but likewife Cookery, which is fo much 
concern’d about the Food of Mankind during Health, 
and alfo Pharmacy, which furnifhes Medicines for 
the reftoring Health when loft, the Art of Dyeing, 
and many other ufefui- Manufactures, all owe their 
Improvements to this Science ; many of which have 
been light on unexpectedly by the Operator, while 
4 he 
