122 THE AMERICAN NATURALIST. [Vor. XXXIX. 
changes, and it points with great force and directness to the 
influence of some other parent than C. kempferi, although this 
has also exerted an influence. In the distribution, size, and 
character of the vessels, there are but few features which serve 
to guide us in forming a conclusion, but it will be noted that the 

Fic. 5.— Catclpa teasi. ‘Vangential section, X 61. Showing vessels with few or no thyloses, 
and the rather 1 li f lenticular f 2-3 cells wide 

conspicuous thyloses of C. kempferi have practically disappeared 
in the hybrid though retained in the initial row of vessels which 
have increased slightly in size and are confined to a much nar- 
rower, radial zone. This points without doubt to the influence 
of the other parent. In the outer regions of the growth ring, 
the vessels are seen to be conspicuously smaller and on the 
