748 The American Naturalist. [August, 
the wax plates the outlines of the sections of the organ to be recon- 
structed, this point, along with that on the dorsal surface, is cut out so 
; 
M | 
ee 
Fig. 2. 
Fig. 2.—The Bristol-Board Guide. x yz, the dorsal and cephalic guide lines 
forming the right angle enclosing the figure of the embryo; 7, the guide point in 
the dorsal surface and in the median plane; m, the guide point in the same plane 
on the lower surface of the neural cord. 
as each to form a point of a piece of wax that remains connected with 
the sections of the organ by bridges of wax (fig. 1).. When the series 
of wax sections have been cut out, they are then arranged in the 
bristol board guide in their proper places, care being taken that the 
two guide points fall within the plane of the bristol-board, and that the 
line passing through them is perpendicular to the dorsal line of 4-2 
(fig. 2). When all are in place, nothing further, of course, remains 
than to smooth off the outer surface of model.—F. C. KENYON. 
PROCEEDINGS OF SCIENTIFIC SOCIETIES. 
Torrey Botanical Club.—May 11, 1897.—Dr. N. L. Britton 
presided. Three new members were elected. Three successful excur- 
sions were reported. Resolutions were adopted commemorating Dr. 
