[ 585] 
a&hefs in performing them, and Veracity in relating 
them, I can rely on : However, for greater Cer- 
tainty, I fhallmyfelf repeat them I am, dear Sir, 
Tour mojl obedient Servant , 
W. Brownrigg. 
IT. 
Memoirs of a. Semi-metal called Platina di Pinto, 
found in the Spanifh Weft Indies. 
A LTHO’ the Hiftory of Minerals, and other fof- 
iil Subftances, hath been diligently cultivated, 
elpecially by the Moderns ji yet it muft be acknow- 
leged, that, among. the vaft Variety of Bodies which 
are the Objetts of that Science, there ftill remains 
Room for new Inquiries. 
No Wonder that, among the great, and almoft in- 
exhauftiblc Varieties of Salts, Ores, and other Con- 
cretes, new Appearances, and Mixtures before un- 
known, fhould daily be difeover’d : But thar, among 
Bodies of a more fimple Nature, and particularly 
among the metalline Tribe, feveral diftintt Specks 
fhould ftill remain almoft whqlly. unknown to Natu- 
ralifts, will doubtlefs appear more ftrange and extra-- 
ordinary. ' f : 
Gold is ufually efteem’d the moft ponderous of Bo-- 
dies; and yet I have feen, in the'Pofleflion of the late 
Profcftbr s’Granjefandf a mefal Line Subftance,brbdght 
from the Eajl Indies , that was fpecifkal.ly heavier than 
Gold, by at leaft a twentieth Pam; Mercury, next 
to Gold, is commonly faid to be the heavieft Body; 
yet Mercury is greatly exceeded- in fpecifrc Gravity 
-1 i •. i. . . , j i l lorn r > bm . 
