Sir GEORGE SHUCKBURGH OH , See. 363 
A few years after this, Meffieurs le monnier and Cas- 
sini {Mem. de PAcad. des Sc. pour 1740) made fome de- 
cifive obfervations, to Ihew that this quantity was very 
confiderable. It was left, however, for Mr. de luc to 
make a much more compleat feries of experiments, 
which he has defcribed and reduced into fyftem in his 
Recbercbes fur la Variation de la Chaleur de PEau bouil- 
lante. It remained only that thefe fhould be verified. 
Towards the latter end of the year 1775 I had an oppor- 
tunity of repeating thefe obfervations with a fmall 
pocket thermometer of about fix inches long, made by 
Mr. nairne; an inftrument, it muft be confefied, not 
very accurate for fuch an examination, but with which I 
thought, however, I could obferve to within a quarter of 
a degree; my obje6t at that time, amidfl: a variety of 
other philofophical purfuits, being to allure myfelf that 
the variation took place, rather than critically to exa- 
mine the quantity of it. I fiiall relate thefe obfervations,. 
as the refult of them upon my return to England ledi 
me to fome more accurate. 
Table. 
