PODS OF THE HYBRID CATALPA AND PARENT SPECIES 
“The fruit is from 12 to 15 inches in length and not more than a quarter of an inch thick in 
the middle,”’ and thus intermediate in size, but the pods are numerous and contain many 
seeds. 
greater on the hybrid than on either of the parent species. 
Japanese species; it is more hardy than 
either of the North American species, 
and, although the flowers are smaller, 
the panicles and the number of indi- 
vidual flowers are much larger.” 
In 1911 Dr. E. M. East, at the Con- 
necticut Experiment Station, crossed 
Catalpa bignonioides by C. Kaempfert, 
this being the reciprocal combination 
of Teas’ undoubted hybrid. The actual 
pollination was made by Prof. H. K. 
Hayes. The trees were grown and 
measured by him for the first years of 
the experiment and later came into the 
hands of the writers. The cross was 
made by emasculating the flowers of the 
bignonioides parent, enclosing them in 
bags and later applying pollen by hand. 
Seed was collected from the same trees 
as used in making the cross which were 
well isolated from each other. The three 
lots of seed were sown in the spring of 
The number of flower clusters and total amount of seed produced per tree is much 
(Fig. 6.) 
1912. Later they were transplanted to 
their permanent position, ten trees of 
each being set at the station farm at 
Mt. Carmel, near New Haven, and 75 
of each on the upland near Portland in 
the central part of the same state. With 
these, in each location, were set a like 
number of trees of C. speciosa which were 
started one year later. It is unfortu- 
nate that these were not started at the 
same time, but they afford some com- 
parison. 
VIGOROUS GROWTH OF THE HYBRID 
As can be seen in Table I, the plants 
grew vigorously. During the summer 
of 1915, the plants at Mt. Carmel were 
severely damaged by wind, the branches 
being badly broken, particularly those 
of the cross, as it was growing the most 
rapidly. Consequently, in order to 
have them start even again, it was 
