for the Application of the Method of Mixtures. 419 



of the accuracy with which determinations may be made, and 

 are not considered to be exact values of the specific heats of 

 pure metals. It is hoped that the results, for the determina- 

 tion of which the calorimeter was designed, may be presented 

 at an early date. In the calculation of results, s, the specific 

 heat of the water used, was taken as unity. The three ther- 

 mometers used for the heater, cup, and water-cooler were 

 made by Mr. H. J. Green, of Brooklyn, N.Y., and were 

 standardized by comparison with Yale Observatory Standard 

 No. 59, made by Tonnelot of Paris, and standardized at the 

 Yale College Observatory by Prof. Leonard Waldo. All 

 weighings were made upon a balance sensitive to ^ milli- 

 gramme under the given load. 



Cadmium. — As supplied for chemical use, purity unknown. 

 Cast in the form of a thin cylinder. 



1895. M. t. 6. T. m. S. 



Jan. 26 132481 -30 1112 85-60 5-0425 -05529 



Feb. 23 „ 2-51 1500 93-38 4*601 -05534 



May 18 , '42 24-15 100-10 2-3675 -05583 



No mean taken on account of different temperatures used. 



Copper. — 99*98 °/ pure ; from Lake Superior. Two pieces 

 taken from a thin bar of drawn metal. 



M. t. 9. T. m. S. 



Julyl 10-9322 19 23°-39 1000 34204 -09475 



„ 2 „ -30 22-42 100-2 3-6403 -09470 



„ 1 23-6625 -25 23-62 99-8 7302 -09467 



„ 2 „ -30 21-51 100-0 8-296 -09474 



Mean -09471 



Glass. — Composition unknown. Two pieces taken from 

 a piece of thin -walled tubing. 



M. t. 0. T. m. S. 



July 3 7-501 %3 23°75 99-95 3-5165 14409 



5 „ -12 21-32 99-90 4-0048 -14402 



„ 5 7-3571 10 20-84 10000 4-0549 -14439 



Mean 14417 



