BOTANICAL GAZETTE. 75 
elsewhere, as shown at ¢,d and e, fig. 4, At e the thickness 
amounts to 2.8". Just beyond e the cork zone tapers out quite 
abruptly, and from this point to the edge of the removed sector 
1s entirely absent, the difference between the annual layers be- 
ing here marked only by the difference in the texture of the spring 
and autumn wood. This gap in the zone (at i, fig. 4) occurs op- 
posite to the area which should be occupied by a fourth wedge 
(corresponding to g, fig. 4), were it present. 
Although these zones 
which have been described 
Having cut transverse sec- 
--i tions of the tissue in ques- 
L*I have not been able to discover any difference in structure between these 
Wedges and the intervening wood, and am unable to account for their presence, 
—— they be three of four normal (?) groups of fibro-vascular bundles, indi- 
“ting kinship with Bignonia capreolata.] 
