222 Journal of the Asiatic Society of Bengal. [N.S., XVI, 
would be somewhat nearer, in the meta derivative somewhat 
further, and in the para derivative still further than that 
Para 
geometrical centre from the side chain containing the optically 
active group. If then the optical activity is determined by the 
Frankland revived this Theory in 1912 in his Presidential 
address before the Chemical Society and sought to illustrate its 
validity by a few selected observations of Cohen and his collab- 
orators : 
Position Isomerism and Optical Activity (Cohen and Dud- 
ley, Trans. 1910, 97, 1737). : 
(M)q20° (M)al00° 
Menthyl benzoate he is —.239°0° — 232:7° 
’ -toluate He. <3 231°} 223°1 
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