THE 73° CALORIE. 387 



by continuous flow calorimetry and one by the use of water hermeti- 

 cally sealed in quartz capsules. This difference may be significant. 

 Unfortunately, however, although it suggests a number of possible 

 explanations of the discrepancy, no one of them, when examined 

 quantitatively, seems to give a correction term of the right order of 

 mae:nitude. 



"b"^ 



Summary. 



The work reported in this paper leads to the value 



1.0040 ± 0.0005 



for the ratio of the specific heat of water at 73° C. to that at 20° C. 

 This agrees more closely with the results of Dieterici, Barnes, and 

 Callendar than with those of Regnault, Liidin, Bousfield, and Jager 

 and von Steinwehr. 



References. 



Bartoli and Stracciati: Beibl. 1891, p. 761, 1893, pp. 638 and 1038. 



Ludin: Diss. Zurich, 1895, Fortsch. d. Phys., v. 56, II, 1903, p. 301. 



Barnes: Phil. Trans. Roy. Soc. (A) v. 199, p. 149, 1902. 



Dieterici: x\nn. (4) 16, p. 593, 1905. 



Janke: Diss. Rostock, 1910. 



Cotty: Ann. Chim. Phys. (8) 24, p. 282. 



Bousfield: Phil. Trans. Roy. Soc. (A) v. 211, p. 199. 



Callendar: Phil. Trans. Roy. Soc. (A) v. 212, p. 1. 



Jager and v. Steinwehr, Ann. (4) 64, 1921, p. 305. 



College of Hawaii, Honolulu. 



