36 Drs. Ramsay and Young on 



We have taken the value of (n + 1) for alcohol as 2*248, 

 for ether as 2*23, and for mercury as 2*21. 



The values of the expression £ at different pressures 



are as follows : — P 



dt 



Alcohol. 



Ether. 



Press. 



Temp. 



dp 



£2-248 dp 



Press. 



Temp. 



dp 



£2-23 dp 



millim. 



abs. 



dt' 



p ' df 



millim. 



abs. 



dt' 



p ' dt' 



23-733 



283 



1-516 



20700 



184-9 



273 



8-843 



12950 



54091 



343 



22-750 



20376 



921-18 



313 



3116 



12393 



1692-3 



373 



58-175 



20721 



2293-9 



343 



62-84 



12341 



2359-8 



383 



75-95 



20592 



7495-7 



393 



153-95 



12156 



5686-6 



413 



151-75 



20226 



13281 



423 



234-9 



12715 



14764 



453 



315-45 



19931 



21804 



453 



336-4 



12921 



22182 



473 



430-8 



19966 











45519 



513 



763-7 



20703 











Mercury. 



1 



Pressures, 



Temp. 



dp 



£2-21 dp 



millim. 



abs. 



dt' 



dt ''dt' 



10-0 



457-30 



0-350 



26486 



100-0 



534-20 



2-506 



26743 



200-0 



563-44 



4-470 



26833 



500-0 



608-03 



9-40 



26703 



10000 



647-20 



16-37 



26697 



3000-0 



723-10 



38-61 



26811 



5000-0 



765-60 



56-90 



26904 



With mercury, the value of n is much more nearly constant 

 than if Regnault's numbers be employed. 



It will be noticed that this number is much higher than 

 that given by Professor Unwin (0*69, while ours is 1*21) ; 

 but it is worthy of remark, that if the values of n be calcu- 

 lated for the stable substances mentioned in our first paper, 

 taking the highest and lowest pressures, and the corresponding 



values of -£■, the value of n varies between the narrow limits 

 dt 7 



1*15 and 1*52. Although we have not verified these values 



for intermediate pressures except in the examples already 



given, it may be of interest to reproduce them, 



