320 ]i,ESEAU,CHES ON KVAPORATTON AND DISROflTATlON. 



pressuroB being rcgiHterod by an siir-gaiigo, onrrcctod by 

 means of Amagat's recent determinations of tlio com- 

 pressibility of air. The constants for formulae of the type 

 log p = a + ha' + r,(i' are : 



log b 

 log c 

 log a 

 log/3 



For Metliyl Alcohol. 

 22;i070'.)6 



i-2(;n)r)87 



0-:)8r.5770 

 i-i)!)988110 

 i-!W5!);)7!)0 

 h and c are both 

 negative. 



For Ethyl Alcohol. 

 .''rU720;)() 

 'i-OiOGi:!! 

 0- 00508,54 

 0-003.?75,38 

 l"9iK;82424 



c is negative. 



For I<lthor. 

 ,5-!)8l!4771 

 0-5240258 

 i-57332.S8 

 1-90827459 

 I-991:J0336 



and c arc both 

 negative. 





For I'ropyl Alcohol. 



a 



4-479370 



log h 



1-3915059 



logo 



0-5509001 



log a 



0-001041423 



log/j 



1-9905702.5 



c is, negative: t = t°C'— 20 



For Acotio Acid. 

 0-700311 

 0-0879733 

 0-1102113 

 i -99881514 

 1-99450874 



h and c are both negative. 



Tlie values of ' '", wlilcli were required in calculating the 

 dl, 



heats of vaporization, were ascertained by calculating the 

 pressure one-tenth of a degree above and below the re- 

 quired temperature, and mtiltiplying the difference by .5. 



The volume occupied by \ gram, of these substances in 

 the gaseous state was determined for low temperatures and 

 pressures by means of a modification of Hofmann's appara- 

 tus, in which pressure volume and temperature could be 

 altered at will. At higher tcmijoraturos and pressures 

 similar relations were determined l)y means of the modified 

 Andrews' a])paratus. With methyl alcohol the limit of 

 temperature was '24(f; with etliyl alcoJiol, 24(5° ; and with 

 the other substances, 280°. For a description of the 



