106 Lillian O'Keeffe. 
in a solid tissue can only be satisfactorily made out by the com¬ 
parison of median longitudinal sections of the apex with sections 
made at right angles to these and to each other, so that the initial 
cell or cells may be viewed in longitudinal, horizontal and transverse 
section. It was found (both in my own sections and in re-examining 
those made by Dr. Cavers) that the account given by Deutsch is 
correct and that although in some cases two, and even three, cells 
of equal length and almost equal width were seen in horizontal and 
transverse sections through the growing-point, one of these cells— 
