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EXPLANATION OF FIGURES IN PLATES XL and XLI. 
Illustrating Dr. Wolfe’s Cytological Studies on Nemalion. 
All figures are drawn at the level of the stage with the aid of a camera lucida, and using the 
apochromatic 2.0 mm. objective of Zeiss with compensating ocular 18, giving an approximate 
magnification of 2250 diameters. Plate XL is reduced about four-sevenths in reproduction, the other is 
reproduced without reduction. Figs. 2-19, 49 and 50 are drawn from specimens crushed and 
stained on the slide in safranin and gentian-violet ; 24, from material preserved in formatin, and 
mounted in glycerine; 25 from a section 1 /x, 22, 35, and 44-48 from sections 3^ in thickness, 
and stained in safranin and gentian-violet ; all others are from 3 n preparations stained . in 
haematoxylin after Heidenhain. 
Oogenesis. 
Fig. 1. Young carpogenic branch, consisting of the primary carpogonial cell borne on a vegeta- 
tive cell. A nucleus and chromatophore are present in each. 
Fig. 2. Older. The procarp is supported upon three modified cells. The branch arises from 
a normal vegetative cell. The procarp is bulging out to form the tricliogyne. 
Fig. 3. The trichogyne is now a narrow protoplasmic process surrounded by a heavy wall. The 
primary egg-nucleus is in its characteristic position below the chromatophore. 
