[ 44 1 ] 
Id. commune. Petitus . . 1 T 7-3 12 
Id. purum. Petitus. . . . 7- l 7° 
Block or Grain Tin. L. > . 7‘ 1 S^ 
Notes and Obfervations. 
As I thought the ufes that might be made of thefc 
Tables, either inbufmefs or in philofophy, would beft: 
be illuftrated by a few fhort notes, I have there- 
fore here occafionally inferted fuch obfervations as 
occurred to me, whilft I was revifmg them for the 
prefs : and as many of thefe related chiefly to the 
prefent defeds of my tables, thofe I thought would 
probably be of fervice, to luch as might hereafter 
take the troiible of improving or correding them. 
As the particulars contained in the Tables were 
extraded from different books, at different times, 
and at firft only intended for my own private ufe, 
1 was not folicitous to preferve one uniform lan- 
guage, but generally fet down every experiment in 
my common-place, in the words of the author I 
took it from : and as I have fmee found, that by a 
tranflation I might fometimes happen not fo juftly 
to reprefent the body intended, I have upon the 
whole judged it beft, here alfo to tranferibe them 
in the fame languages in which they were at firft. 
delivered. 
To make experiments of this fort with a fuflicient 
degree of accuracy requires a pretty deal of care and 
pains : and as in fuch as I have made myfelf, I have 
found great conveniency in the ufe of decimal 
weights, preferably to thofe of the common form, 
M m m 2 I 
