.156 ESSAYS AND OBSERVATIONS 



found the moft part of the water frozen, and 

 the velTel containing the aether furrounded 

 with a thick and firm crufl of ice. 



Such a means of producing cold, and to 

 fo great a degree, has not, fo far as I know, 

 been obferved before, and it feems to deferve 

 ■ being further examined by experiments. 

 Till that is done, I do not chufe to give any 

 account of fome other remarkable phcemmena 

 that have occurred in the above experiments, 

 nor to enter into the feveral fpeculations that 

 the fubjedt feems to fuggeft. 



Since writing the above, I have had occa- 

 sion to obferve, that Mr- Richman of the A- 

 cadamy of Peterjburg has taken notice of the 

 effeft of evaporating fluids in producing cold; 

 but does not impute it to the evaporation 

 alone. His very exad; account of the phcem- 

 mena y and his theory with regard to them, 

 may be feen in Nov. Comme?it. Acad. Petropo^ 

 litance ad ami. ly^y & 1748. page 284, 



Art? 



