Corundum Stone from Asia. 
409 
«--I got at the Follam, with the charge of it. The distance 
from this place, by Namcul, is 84 miles. 
The Charges of 501b. JVeight of Corundum. 
« Nine Tritchinopoly measures of the Corundum stone weigh 
“ ^olb. 
Average and Cost at the Pits.* 
0 p. f. c. 
“ i\ Madras fanams per measure - - — 13 4° 
“ Cooley from thence to Tritchinopoly - — 28 40 
“ Ditto from Tritchinopoly - - - 1 13 40 
Pagodas - 2 10 40 
“ The stone is delivered by measures, and paid for at the 
“ Pollam, in the gold fanam. 
“ I am, &c. 
“ Edward Garrow. 
Nov. 15, 1792.” 
This letter contains very interesting topographical observa- 
tions on the mine The specimens sent were of one sort, of a 
greyish colour, with a shade of green. The entire crystals, which 
I selected among the broken ones, were of course few in pro- 
portion ; but, with the addition of some distinct crystals, which 
Col. Cathcart and Capt. Colin Macauley had sent me, have 
been sufficient to ascertain the structure and form of the crys- 
tals, of which an analytical description will close this Paper. I 
shall, therefore, now say nothing concerning their form, but 
* The above is the prime cost. I have been informed by correspondents, who 
purchased some in retail, that it was sold for about six shillings a pound, at Ma- 
dras* , 
8 G 
MDCCXCVIII. 
