878 



gravity, as at [jreseiit assumed, was |)robably uol entirely accurate, 

 and we made preparations for an aecurale determination. A prelimi- 

 nary measurement gave the normal density as 0.001783'. 



The account of our investigation had already been written, when 

 a paper appeared liy H. Schultze') in which the specific gravity 

 of argon is given as 0,00178376. When we use this value, we 

 obtain the results given in columns 7 and 8 of the above table. 

 The mean difference between the determinations with the baroscope 

 and those by method A is now only 0.047o, in other words there 

 is no sign now of a systematic deviation between the two methods. 

 This result proves on the one hand the reliability of metliod A and 

 may on the other hand be taken to confirm Schultzk's result. We 

 hope soon to be able to publish tlie results of a more accurate 

 direct determination. 



111. The tempevdture measurement. 



Tlie measurements were made in a bath of liquid oxygen. In 

 the construction of the cryostat as well as of many other parts of 

 our apparatus we could avail oursehes of the experience gained 

 in the cryogenic Laboratory at Leiden, where one of us had the 

 advantage of working for several years under the guidance of 



1) Ann. d. Physik 48 (1915) p. 269. Heft 2 published U Oct. '15. 



