120 THE AMERICAN NATURALIST. [Vor. XXXIX. 
given and brought into direct comparison in order to ascertain 
what characters have been derived from it. By elimination it 
wil then be possible to refer the remaining characters to either 
C. speciosa or C. bignonioides. 
C. kempferi (Figs. 2, 6). 
Transverse.— Growth rings very broad. Differentiation of the spring 
and summer woods well defined (?), the latter constituting the bulk of the 
growth ring and defined by a somewhat abrupt transition in the form, size, 
and thickness of wall of the component cells. The spring wood composed 
of large, variable, squarish-hexagonal and tangentially elongated, non-resin- 
ous, and thin-walled cells which form a limiting zone external to the previous 
growth ring; soon replaced by the somewhat abruptly smaller, rather thin- 
walled, hexagonal and radially elongated cells of the summer wood which 
diminish almost imperceptibly toward the outer face of the growth ring- 
Wood parenchyma strictly confined to the composition of the vessels. 
Tracheids conspicuously squarish, rather uniform, in regular radial rows, 
more or less resinous, rather thick-walled and forming a limiting layer 
upwards of six cells thick on the outer face of the summer wood, or oppo- 
site the most recently formed small vessels, joining with the latter to form 
radially extended tracts of irregular form and extent, or even forming 
detached groups centering in small vessels, so as to form a second zone 
of imperfect development. Vessels somewhat numerous and scattered 
throughout the growth ring; those of the early spring wood with strongly 
developed thyloses; at first rather small, numerous and round, but abruptly 
enlarging with the corresponding transition from the spring to the summer 
wood cells, and becoming oval or radially extended and 2-3 compounded 
in radial series, predominant; again abruptly reduced in size and number, 
sometimes radially 2-3 seriate, and thence continuing without much varia- 
tion to the region of the outer summer wood where they are once more 
cheids. ary rays prominent, sparingly resinous, 1-3 cells wide, 
distant upwards of 427 
adial.— Medullary rays sparingly resinous ; the cells within the region 
of the early spring tracheids chiefly short; isodiametric; the upper and 
lower walls rather thick and strongly pitted; the terminal walls thicker 
and more strongly pitted; the lateral walls with numerous small pits in 
more or less definite radial series; in older parts of the growth ring the 
cells increase greatly in length, except the marginal ones which remain 
short and become much higher, the pits on the lateral walls opposite ves- 
sels become much larger and oval. Wood parenchyma of the spring wood 
composed of short and thin-walled cells which bear rather numerous, - 
versely oval, simple pits on the radial walls; those of the vessels of later 
