132 : THE AMERICAN NATURALIST. [Vor. XXXIX. 
Percentages of characters. 
(Those common to all are omitted.) 
Number. Percent. 
Hybrid 4- en + gy ds sr. 
Hybrid + sp o 00.00 
Hybrid 4- bignonioides- . I 3.12 
Hybrid + kem I 3-12 
Kempferi + bignonioides - o 00.00 
Kampferi only : ; : : Qu x à : 3 9.4 
Bignonioides only . 2 6.24 
Hybrid only 2 6.24 
Speciosa only 1I 34-4 
Speciosa + bignonioides 1 T 13 
Speciosa + kampferi I J: 
Total 3 99.84 
From this percentage summary it appears that C. speciosa 
embodies 34.4 % of characters which are peculiar to itself, while 
C. kempferi and C. bignonioides possess 31.2 % of characters 
which are not only common to each other but also common to 
the hybrid, the remaining characters belonging, with one excep- 
tion, either to these last two species or to the hybrid. From 
these facts therefore, we are abundantly justifed in the fol- 
lowing conclusions : — 
1. Hybrid characters are expressed in the structure of the 
vascular cylinder as well as in external alterations of form and 
color. | 
2. Catalpa speciosa is not in any way concerned in the pro- 
duction of Teas Hybrid. . 
3. Teas Hybrid Catalpa is the product of a cross between 
C. kempferi and C. bignonioides, thus confirming the conclu- 
sions already reached by Sargent on the basis of external mor- 
phology. 
4. The dominant characters of the hybrid, as expressed in 
the internal structure, are those of the Japanese parent as simi- 
larly manifested in the external characters. 
5. The resultant characters are most strongly exhibited in 
transverse section, less so in the tangential, and least of all in 
the radial. 
