430 in TOWER; DARWINISM. 
selected locations that ranged in condition from those that would 
be constantly moist tosthgse that would be rather constantly dry 
on the western slope. In 1913 an abundant supply of these beetles 
was obtained in the Canal Zone. They were taken indiscriminately 
and mixed without regard to their points of origin in the Canal 
Zone, an additional supply obtained in the valley of the Rio 
Changuinola, and all transported by horseback over the trail and 
distributed at random among the twelve stations selected in the 
previous year. Two months later the same trip was made again 
to inspect these experiments, along with other observations it was 
desired to make. 
In all twelve locations the numerous beetles left for breeding 
purposes had reproduced abundantly, irrespective of the different 
environmental conditions, so that the reproductive process up to 
and through the deposition of the eggs was not interfered with. 
The success of the reproductive process differed greatly among the 
different stations. At the first three stations on the eastern ‘slope, 
tbe progeny were numerous and flourishing. Three stations in the 
region of Boquetti were also in thriving condition, with abundant 
progeny. Of the six stations placed in drier locations to the south 
and west of Boquetti, the four driest showed a large number of 
dried-up egg-clusters on the under sides of the leaves, some of 
the adults still alive and laying eggs, but no living larvae, while 
each of two intermediate stations had abundant desiccated egg- 
clusters and a few larvae that looked neither healthy nor prosperous. 
As far as could be defermined, the individuals of the parental 
groups had not been affected by their environmental conditions, 
and even at the driest locations, freshly laid eggs were discovered. 
In the following year, a hurried inspection was made in the spring, 
with the result that at the first three stations on the eastern slope, 
the beetles were present and breeding; at the three stations at 
the bottoms of moist barrancas there were also thriving groups; 
but at the six drier stations no trace of the introductions remained. 
At a thirteenth station which was perhaps the driest one selected in 
the previous year, a group of food plants was found available, growing 
wild, and larvae were brought to this location from each of the 


