237 
conceived to be three miles in diameter. We ex- 
pect from him a dissertation on the subject, which 
is not new; as Hevelius saw a similar phenomenon, 
though he was not able to account for it. Herschel 
had before discovered two new satellites to his 
Georgian planet. 
Mr. Walker, apothecary to the Infirmary at Ox- 
ford, has produced a frigorific mixture with salts 
and acids only, by which he has frozen mercury 
last week when the thermometer was at forty-five. 
His cheap process, which produces forty-six degrees 
of cold, may be useful to cool your wine, &c. It is 
oil of vitriol mixed with an equal quantity of water, 
cooled by putting into it Glauber salts finely pow- 
dered. These I think are our three things, the new- 
est this season, for the Philosophical Transactions. 
We begin to look out for your return, which I 
suppose will be in autumn; and have a long list of 
queries for comparison with your herbarium. Sib- 
thorp is expected here shortly. 
Yours most faithfully, 
Jos. BANnKs. 
Marquis Ippolito Durazzo to J. E. Smith, Milan. 
Dear Sir, Genoa, June 8, 1787. 
Your letter of the 23rd of May came safe to my 
hands, and afforded me some notices of you, which 
I wanted of. I thank you for the part you take 
on the loss of my father, which has been very much 
felt by all our family. It seems, by the history of 
the Capuchin, you were astonished to hear I was 
