Miscellaneous Contributions by Dr. Hare. 7 



course we must not assume the resistance exerted by the 

 water within the vessels against a further accession of water 

 from the tube, as any evidence of an equality in the portions 

 previously received by them. 



In like manner, the height of the mercury in the thermom- 

 eter, shows the resistance which substances, whose tempera- 

 tures it measures, are making to any further accession of ca- 

 loric : but it does not demonstrate the quantities, respectively 

 received by them, in attaining to the temperature in question. 

 This varies, in them, in proportion to their attraction for this 

 self-repellent fluid ; as the quantities of water received by 

 the vessels A, B, C, are varied in the ratio of their respective 

 areas. 



Method of Dividing Glass, by Friction. 



■"W//A 



Some years ago, Mr. Lukens showed me, that a small phial, 

 or tube, might be separated into two parts, if subjected to 

 cold water, after being heated by the friction of a cord made 

 to circulate about it by two persons alternately pulling in op- 

 posite directions. I was subsequently enabled to employ this 

 process, in dividing large vessels, of four or five inches in di- 

 ameter, and likewise to render it in every case more easy, and 

 certain, by means of a piece of plank forked like a boot- 



