1881.] Existence of Ice and other Bodies in the Solid State. 285 



several fruitless attempts the following plan, involving the principle of 

 the cryophorus, was adopted. 



Fig. 1. 



A strong glass bottle, snch as is used for freezing water by means 

 of Carre's pump, was fitted with a cork and glass tube C (fig. 1), and 

 the cork well fastened down by copper wire and paraffin wax. A and 

 were then filled with mercury, and C connected with the end of the 

 tube DE by means of the piece of stout india-rubber pump tubing B, 

 a thermometer having been previously attached by the wire x to the 

 lip of the tube at B. The connexion at B was made tight by fine 

 copper wire. The tube DE was about one inch in diameter, and 

 about four feet long from the bend to the end E ; after connexion 

 with C it was completely filled with mercury, care being taken to expel 

 the air from A, C, and DE as completely as possible; the whole was 

 then inverted over the mercurial trough F, as shown in the figure, when 

 the mercury fell to o, the ordinary height of the barometer. The 



