at low Temperatures. 143 



raising It gently, drawn from the side to the centre of 

 the surface of' the mercury. When it was fixed and the 

 whole was solid, it became necessary to withdraw the 

 glass, and expose it a moment to the air of the room, until 

 that paj-t of the mercury attached to the glasswas softened; 

 then, by keeping one hand drawing gently at the wire, 

 the whole oF the mercury was suspended, and, with the al- 

 cohol, immediately returned to its place in the cooling 

 mixture ; the mercury was now suspended from the hydro- 

 static balance by the wire fixed in it, and weighed with great, 

 accuracy ; — and the following observations were made from ; 

 the time the second quantities of muriate of lime and snow 

 were lilixcd. 

 In 5 minutes the mercury was crystallizing. 



JO became nearly solid. 



30 quite solid — withdrawn. 



40 ^ having been replaced. 



50 suspended in the alcohol, and 



weighed by the hydrostatic balance with great care, 



lost 60-8 



6o minutes the mercury and alcohol having been a little 



withdrawn, the mercury lost 6o 

 85 minutes the mercury lost 59*9 it was now so nearly 



fluid, there was splendour on the surface. 

 130 minutes the mercury lost 60*8 



1)5 CO-3 



150 60-1 



160 CO-3 



( having been withdrawn, 

 1 70 • ■ ■ ■ ■ ' ■ 60* 1 ^ and the temperacureia*- 



^ crease^. 



175 — 60-r 



180 61 



As I could not decrease the heat so as to indicate a greater 

 loss than 6 1 , and my own body dufing these three hours having 

 suffered an unusual and partial deprivation of heat, I withdrew 

 the mercury and alcohol, not doubting, if it could have at^- 

 swert^d any purpose, by these means to have been able to 

 have kept the mercury solid some hours longer, the sur- 

 rounding substances having lost so much heat. 

 AVe see from the observations made in this expepimootj that 



5U-9 



