464 



Dr. T. Carnelley on the 



( Butyric acid, 

 \ Ethyl acetate, 



Valerianic acid, 



Ethyl propionate, C 6 H 10 O s 



C 5 H in 0; 



{ 



fCai 



-jEtt 

 IBui 



C 3 H« 2 . 

 C 3 H 6 2 . 

 C 3 H 6 2 • 



C 4 H 8 2 . 



C 4 H 8 2 . 



C 5 H 10 2 . 



Coefficients of 

 capillarity. 



... 189-0 



.. 534-5 



542-0 



129-5 

 450-3 



92-3 

 360*3 

 362-8 



64-0 

 297-0 

 305-3 



230-2 

 241-3 



Boiling- 



point 



o 



141 



56 



54 



I 



162 1 

 74/ 



175 

 100 

 102 



205 

 119 

 116 



1401 

 .134 J 



Propyl acetate, 



Caproic acid, C 6 H 12 2 ... 



Ethyl butyrate, C 6 H 12 2 . . . 



ityl acetate, C 6 H 12 2 .». 



J Amyl acetate, C 7 H 14 2 . . . 

 \ Ethyl valerate, C 7 H 14 2 . . . 



Passage of Gases through a Liquid Diaphragm. — Draper 

 has shown that a soap-bubble immediately expands in size on 

 being introduced into a vessel containing C0 2 , owing to the 

 gas passing through the liquid diaphragm of soap more ra- 

 pidly than the air passes out. Exner (Pogg. Ann. civ. 

 pp. 321, 443) has made this observation the basis of a method 

 for determining the rapidity with which gases diffuse through 



such liquid diaphragms ; and he has found that a= — -, where 



a= rapidity of diffusion, c= coefficient of absorption of the 



molecular weight of gas , .. „,, mi 



gas, d= 5— e ^— = density of the gas. Inus: — 





c. 



eZ(air=l). 



c 



a, observed. 



a, calcu- 

 lated. 



N 



•015 



•017 



•030 



•025 



•019 



1002 



3-165 



700 



•97 

 1-00 

 Ml 



•48 



•07 

 1-52 

 117 



•59 



•015 

 •017 

 •028 

 •036 

 072 

 •812 

 2 94 

 903 



•86 



100 



1-95 



2-27 



3-77 



4710 



165-00 



4600000 



•85 



100 



1-60 



2-12 



3-89 



45-10 



163-30 



54450-00 



Air 



O 



Coal-gas . . . 

 H 



C 



H S 



NH, 



Absorption of Gases by Charcoal. — Saussure and Hunter 

 have determined the volumes of various gases which are ab- 

 sorbed by 1 volume of charcoal under given conditions. If 

 we take their results and multiply the volume found by them 

 by the respective densities of the various gases, we obtain the 

 relative weights absorbed by 1 volume of charcoal ; and on 



