DESIGNATION OF TEMPERATURES. 3 



The works are designated by letters, the papers by Arabic numerals. The 

 former have no definite order, and no significance is to be attached to their 

 I sequence. 



The papers are numbered, so far as possible, as in the " Catalogue of 

 Scientific Papers " published by the Koyal Society of London (A), where 

 the order is intended to be chronological. The eight volumes of that 

 Catalogue already published include the papers which have appeared between 

 the years 1800 and 1873. On our list, the papers issued since the latter 

 date are assigned provisional numbers in italics. 



In the case of papers, as in the Royal Society Catalogue " when possible, 

 Doth the volume and the year have been given. With Transactions of 

 Societies the year to which the volume belongs, and not the year of 

 3ublication, has been given. A date enclosed in brackets marks the time 

 when a paper was read, which occasionally precedes by some years the date 

 of the volume in which it is printed." 



We shall be thankful for corrections or suggestions which may make the Bibliography 

 more extensive and accurate. 



II. THE DECIMAL SYSTEMS. 



4. The two decimal systems used in scientific work are : 



1. The measurement of Temperature upon the centigrade scale by the 

 thermometer of Celsius. 



2. The metric system of Weights and Measures. 



THE CENTIGRADE THERMOMETER. 



5. Upon this, the Thermometer of Celsius, (zero) represents the 

 emperature of melting ice. The point attained by the column of Mercury 

 it the temperature of boiling water is marked 100 (one hundred). 



Between these two points, the scale is divided into 100 degrees in groups 

 >f 10 each. 



According to this scale, the average temperature of the human body is 

 >etween 37 and 38, and that of the comfortable atmosphere of a sitting- 

 oom in winter about 20. 



Fahrenheit's Thermometer. Upon this, the melting point of ice is 

 narked 32, and the boiling point of water 212. 



6. Comparison and Reduction of the two Scales. Since the 

 Fahrenheit thermometer is largely used in English-speaking countries, the 

 olio wing Table and Formulae may be useful. The former is taken from 

 Jittre et Robin, (A, 1594, Article " Thermometre ") 5 the latter from 

 )unglison, (A, 488, Article "Heat"). 



