THE PHYSICAL PROPERTIES OF METHYL-ALCOHOL. 



533 



II. From 30 to 100 per cent. — continued. 



Percentage. 



Specific Gravity 

 at 0°. 



Difference. 



a. 



Specific Gravity 

 at 15°-56. 



Difference. 



73 



880 03 



234 



78-69 



867 79 



242 



74 



877 67 



236 



79-20 



865 35 



244 



75 



875 30 



237 



7971 



862 90 



245 



76 



872 90 



240 



80-22 



860 42 



248 



77 



870 49 



241 



80-72 



857 93 



249 



78 



868 06 



243 



81-23 



855 42 



251 



79 



865 61 



245 



81-73 



852 90 



252 



80 



863 14 



247 



82-22 



850 35 



255 



81 



860 66 



248 



82-72 



817 79 



256 



82 



858 16 



250 



83-21 



845 21 



258 



83 



855 64 



252 



83-70 



842 62 



259 



84 



853 10 



254 



84-19 



840 01 



26l 



85 



850 55 



255 



84-67 



837 38 



263 



86 



847 98 



257 



85-16 



834 73 



265 



87 



845 39 



259 



85-64 



832 07 



266 



88 



842 78 



261 



86-12 



829 38 



269 



89 



840 15 



263 



86-59 



826 68 



270 



90 



837 51 



264 



87-07 



823 96 



272 



91 



834 85 



266 



87-54 



821 23 



2 73 



92 



832 18 



267 



88-01 



818 49 



274 



93 



829 48 



270 



88-48 



815 72 



277 



94 



826 77 



271 



88-94 



812 93 



279 



95 



824 04 



273 



8940 



810 13 



280 



96 



821 29 



275 



89-86 



• 807 31 



282 



97 



818 53 



276 



90-32 



804 48 



283 



98 



815 76 



277 



90-78 



801 64 



284 



99 



812 95 



281 



91-23 



798 76 



288 



100 



810 15 



280 



91-68 



795 89 



! 



287 



Appendix. 



The vapour density apparatus referred to in the context is constructed on 

 the same principle as the measurer in the set of apparatus for gas analysis 

 which was introduced by one of us some years ago (see " Challenger " Memoirs, 

 Physics and Chemistry, vol. i. p. 143). As shown by Plate XXXIII. fig. 1, it 

 consists of a Gay-Lussac burette-like combination of a wide with a narrow glass 

 tube, which, by means of a long tube of capillary india-rubber slipped over the 

 lower end a, communicates with a movable mercury reservoir b. The main 

 tube near its upper end is contracted so as to produce a neck which is provided 

 with a very well ground-in glass stopper. The same tube bears a millimetre 



VOL. XXXIII. part 11. 4 1 



