[ 249 1 
cover it at once, he often makes a new one, rather 
than give himfelf the trouble to fearch for it. 
The high magnifier I have been fpeaking of in- 
creafes the objedt 2560 times in diameter; it is the 
firft and only one he has ever fucceeded to make of 
that high power; fo that this prefent is a curious one. 
S 1 R, 
Read Nov. 14, A Greeable to the promife in mine of 
* 7 ^ 5 * the paft, I enclofe you Father 
di Torre’s inftrudlions for the ufing of his glaffes ; 
and I fubjoin an account of three feveral obfervations 
1 made with him, at his requeft, of the human 
blood. The account may be thought longer than 
was necefTary ; but I was willing to be as full and 
particular as poffible, as I confider’d it as a kind of 
appeal to my teftimony, and as the ob^edt of it re- 
fpedted the improvement of thofe branches of fcience 
fo interefling to mankind, the medical and anatomical. 
I have put down only what I faw, without any re- 
gard to what he has printed. As Father di Torre’s 
more particular view in propofing to me to go through 
thefe obfervations with him, was the fatisfying of the 
Royal Society of the fidelity and exadtnefs of the ac- 
count he has given of this fubjedl in the book he 
lately prefented to them, I muft defire the favor of 
you to lay my account likewife before them ; and you 
will alfo pleafe to deliver to them his paper of in- 
ftriidlions for the ufe of the glah'es he has fent them. 
J am, with great truth, SIR, 
Your mofl obedient fervant, 
To Daniel Wray, Efq; 
F. H. Eyles Stiles. 
K k 
VoL. LV. 
Defcripiio 
