446 



Drs. Ramsay and Young on 



These complete the data for ether. It appeared necessary 

 to examine the relations between volume, temperature, and 

 pressure for carbon dioxide, because it is chemically entirely 

 different from ether, and also because the data are furnished 

 by Dr. Andrews, whose experimental skill was very great ; and 

 w r e shall prove that his results entirely corroborate our views. 



It was first necessary to correct the pressures given by him 

 in atmospheres by means of Amagafs results, so far as that is 

 possible. As Amagat's experiments on the compressibility of 

 dry air do not extend beyond 65,000 millim., no correction was 

 possible above that pressure ; and extrapolation is inadmissible, 

 inasmuch as the minimum value ofpv for air is at 60,000 millim. 



Data for obtaining the actual volume of carbon dioxide used 

 are given by Andrews. The weight was calculated in the 

 following manner : — Andrews gives the volume of carbon di- 

 oxide filling his tubes at 0°and076 millim., and fromEegnault's 

 data the weight was calculated. This refers to Andrews's first 

 paper (Phil. Trans. 1869, ii. p. 575). In his second paper 

 (Phil. Trans. 1876, p. 421) no direct data are given from 

 which the weight can be determined ; but we succeeded, by 

 combining the results given in his various tables, in arriving 

 at the weight without any serious error. 



His results are reproduced in an available form in the 

 following Tables : — 



Table IV. (The first quantity weighed 0'000612 gram.) 



Temp. 



13°-1. 



Temp. 



21° -5. 



Temp. 



31°-1. 



P. 



Vol. of 



P. 



Vol. of 



P. 



Vol. of 





1 gram. 





1 gram. 





1 gram. 



millim. 



c. c. 



millim. 



c. c. 



millim. 



c. c. 



68726 * 



1-038 



46600 



1-232 



63462 



1-389 



56333 



1-059 



46383 



1-241 



61416 



1-425 



40725 



1-104 



45490 



1-484 



59540 



1-470 



37631 



1124 



45155 



2-270 



57847 



1-495 



37459 



1-145 



44962 



3-124 



56178 



1-812 



37074 



1-377 



44787 



4-760 



55010 



2-234 



36942 



1-547 



34907 



8-118 



54588 



2-338 



36816 



1-972 







53089 



3-814 



36719 



2-758 







51709 



4192 



36668 



3-733 







50390 



4-534 



36610 



5-004 







49118 



4-855 



36528 



6-554 







47910 



5-147 



36433 



6595 







46725 



5-471 



35497 



6-964 







45622 

 44577 

 43611 

 43182 

 41761 

 40895 



5-750 

 6009 

 6-265 

 6-515 

 6-765 

 7-003 



* The pressures to which an asterisk is affixed are not corrected. 



