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XLIV. ExtraSi of a Letter from Rome, 
to M. Maty, M.D.Sec. R. S. on the extra- 
ordinary Heats obferved there this laf 
Summer . ' , 
Rome, Auguft 27, 1768. 
ReadDecember 15, $ I remember, when Mr. M — « 
1/OS ' JljL was here, he Teemed defirous to 
afcertain the degrees of heat and cold ; I cannot help 
mentioning the excefiive heat of this fummer, which 
is much greater than has been known in Rome for 
many years. Friday, the 19th inftant, the mercury 
in a well-regulated thermometer according to Fahren- 
heit’s fcale, expofed at a North window, where there 
was no fun and very little reflection, flood from ten 
o’clock in the morning until about five in the even- 
ing at ninety-nine. About half an hour after fun- 
let it fell to ninety, and at midnight was fallen to 
eighty-five, where it remained all night. This is the 
hottefi day we have had, but for thefe three weeks 
paft at midday the mercury has been always above 
ninety four, and at midnight feldom under eighty- 
three, which is the more extraordinary as I do not 
remember to have obferved any other fummer above 
eighty-nine at midday, nor above feventy-five at 
midnight. Notwithflanding this great heat, there 
was never a more healthy fummer at Rome j all the 
hofpitals are almoft empty, 
James Byres. 
XLV. An 
