CENTIGRADE THERMOMETER. 305 



(from 3.2 to 212), and by the Centigrade into 100 (from to 

 100). Zero in Fahrenheit's thermometer is 32 below the 

 freezing-point of water, and in the Centigrade thermometer the 

 freezing-point of water is called zero. 



A degree Centigrade is larger than a degree Fahrenheit 

 in the proportion of 180 to 100, or 9 to 5; and to con- 

 vert degrees of Fahrenheit into the Centigrade the rule is 



5 



to subtract 32 and multiply the remainder by ^ ; and the rule 



y 



to convert degrees of the Centigrade into Fahrenheit's is to 



g 



multiply the Centigrade by -, and add 32 to the product. 



o 



In scientific experiments the Centigrade thermometer is 

 almost invariably employed, and is generally quoted in scientific 

 books. New works on chemistry in the British Islands usually 

 adopt metric weights and measures, as more convenient, and as 

 better suited to the international communication of knowledge. 



A commencement of improved international relations has 

 recently come into operation under British postal authority, in 

 the Ijfl?. foreign postal card. Parliamentary sanction is still 

 requisite in this country to render Mr. Ewarf s Act of 1864 

 thoroughly efficient by empowering a dealer to recover debts in 

 British commercial transactions where the goods have been 

 sold by metric weights or measures. 



