1 88 Prof. Tyndall on the Absorption and 



For these quantities the absorption is proportional to the den- 

 sity, but for large quantities the usual deviation is observed, as 

 shown by the following observations : — 



Tension. 



^ inch 

 1 inch 



By mercurial gauge. 



Deflection. Absorption. 



157 

 216 



Did the proportion hold good, the absorption for an inch of 

 tension ou&-ht of course to be 314 instead of 216. 



Table VIII.— Iodide of Ethyle. 

 Unit- measure y S th of a cubic inch. 



Absorption. 



Measures. 



Tension. 



iinch 

 1 inch 



Observed. 



Calculated. 



54 



51 



10-3 



10-2 



168 



153 



22-2 



20-4 



26-6 



25-5 



31-8 



30-6 



35-6 



35-9 



40-0 



408 



44-0 



459 



47-5 



510 



By mercurial gauge. 



Deflection. Absorption. 



56-3 



58-2 



94 

 120 



Table IX.— Iodide of Methyle. 

 Unit-measure y'^th of a cubic inch. 

 Absorption. 



Measures. 



Observed. 



Calculated. 



1 



3-5 



34 



2 



70 



6-8 



3 



10-3 



102 



4 



15-0 



136 



5 



17-5 



170 



6 



20-5 



20-4 



7 



240 



23-8 



8 



26-3 



27-2 



9 



300 



30-6 



10 



32-3 



34-0 



