( "5 ) 
camentorum, an cerevifise illius, an nature beneficio 
difrupti 6C expulfi fint. Ex fegmentis fruftulorum 
valde convexi?, quae hie mitto, & quae adhuc adfervo, 
judicare licet, vix ullum illorum calculorum nucem 
mofehatam fuperafie, plures vero tninores fuifte. In- 
terea tamen folutionem calculorum in vefica haud 
prorfus impoflibilem effe, mihi evincere videntur, licet 
res forte quam rarifiime contingat. Vale mihique fave. 
Dab. Helmjladii in Acade- 
mia Julia ipjis Calendis 
Oftobris, m itCC xxx. 
IV. A Letter from the (peVerend William Der- 
ham, T>. V. Canon of Windfor, and 
F. <!(. S. to Sir Hans Sloane, (Bar * 1 - Br<zf. Coll. 
Med. isr $(. S. concerning the FROST in 
January, 173?. 
H E late Froft having been almoft as intenfe as 
any that hath been for many Years, I fend you 
my Account of it; which if you think worth the 
Cognizance of the Royal Society , be pleafed to impart 
it to them. 
•In the Pkilofopkical Tran factions for November 
and December, 1709, Numb. 314, I have given an 
Account of fome of the moft remarkable Frofts that 
I could find any Relation of ; and particularly of that 
great and, I had almoft faid, univerfal one in 1708, 
which the Society had very good Hiftories of from 
divers Parts, and which, in that LranfaSlion, I have 
given an Account of from the Original Papers, which 
the 
