go BOTANICAL GAZETTE 
ing them from future collections. The Darlington mat 
fixed at the tree in corrosive-acetic (aqueous solution of co 
sublimate 95 parts, glacial acetic acid 5 parts), the prey 
being exposed at the sides or removed with the nucell 
the integuments. Sections 5 or 10 in thickness were 
and archegonium the latter stain was most used; 
embryos a combination of Delafield’s haematoxylin and s: 
gave the best results. 
Most of the work has been done in the Bonn laborato 
I wish to express here my appreciation of the unfailing 
= Professor Strasburger. 
THE POLLEN SAC AND POLLEN GRAIN. 
: _ sporophyll, as in the Abieteae, but they differ from 
Ac less sunken in the tissue and in their wider se 
Lic ened bands, and of three or four layers of thin « 
ally almost completely collapse. Within these fi 
red oe which - boeeetan say the 
cribed a very like that of the Abicteae, whi 
rom the generally a ycred wall found in the 
ae - Taxodium 
la the development of the pollen the yong 
Te wings have already rea hed 
from the uninucleate to the compl 
