136 On the Thermometer. 



rate slate. The series of experiments I proposed to myself 

 oil this subject have not yet been completed ; but I may re- 

 mark, that the result of some of those I have made pro- 

 mises to afford practical hints of considerable importance 

 to those brewers whose products arc intended to afford spi- 

 rituous liquors. 



From this notice it will be observed, that I have scarcelv 

 yet entered on the wide Held of inquiry, for cultivation of 

 which, the method alluded to appears to offer so powerful 

 an instrument. Alcohol only has been subject to experi- 

 ment ; it was the only liquid vvhich had resisted all at- 

 tempts to reduce it to the solid stale by the abstraction of 

 caloric. If these experiments be correct, we may now pro- 

 nounce it a general law to which there is no exception, that 

 all liquids with which we are acquainted may be reduced to 

 the solid state by a suitable abstraction of caloric. Whether 

 all gases may be susceptible of reduction to the solid state, 

 by the abstraction of caloric, remains to be ascertained ; 

 although, as I have mentioned, analogy renders it in the 

 highest degree probable. 



The examination of the singular substances which alco- 

 hol prepared by Richter's process contains, has drawn me 

 aside from the course of experin)ents I prescribed to myself, 

 and taken up that time which I intended to have devoted to 

 the examination of the effects of cold on the gaseous bodies. 

 Whether I shall proceed to these bodies, or resume the ex- 

 amination of the habitudes of the alcoholic impurities with 

 the re-agents, will much depend on the leisure which I can 

 obtain ; but, to whichever of them I may direct my atten- 

 tion, I shall not fail to give the earliest information of the 

 result to the Institute. 



XXI I . A Comparative Scale of the Thermoweters of Celsius, 



or the Centigrade^ — Reatimur^ — Fahrenheit, and IValker. 



I 



To Mr. Tilloch. 



Sir, — ZJLT the suggestion and request of a medical gentle- 

 man, eminent in his profession, and highly esteemed for 

 his knowledge of science in general, I drew up the table 

 annexed. 



Should you consider a copy from it not undeserving of a 

 place in the next number of your Magazine, I request you 

 voill have the goodness to insert one; presuming myself, 

 that it might form a useful appendage to a paper of mine 



