3S0 



A, W\ Ewell — Rotatory Polarization. 



parallel light from an arc light lantern, which passed in suc- 

 cession through polarizer, biquartz, jelly tube and analyzer. 



L&±.~ 



'Jub^l AlL:.: 



■ ■ m 



fjjlf 







/ 











Twist. 



The position of the analyzer for the untwisted jelly was 35. 

 When the jelly was given a certain unmeasured positive twist 



Twist. 



the position of the analyzer was 59 showing a rotation of — 24. 

 When the jelly had a certain negative twist the analyzer read 

 10 showing a rotation of 24. 



Glass.— A glass rod was secured from the John A. Brashear 



