138 
receptacle with a screen over the top which will allow the parasites. 
to escape. Or, if the bags are piled some distance from available 
food supply, the parasites will be allowed to escape and the 
young bagworm, since it possesses limited powers of locomotion, 
will die before being able to reach suitable food plants. 
Since in the control of most insects we are largely dependent 
upon the enemies provided by nature it is quite advisable that 
we should do all in our power to know and encourage these 
enemies. Probably the occurrence of frequent epidemics of 
harmful insects is due very largely to the suppression of their 
natural enemies and with the reoccurrence of these the epidemic 
subsides. Very often the favorable results which we attribute 
to our own efforts are mainly due to the interference of nature. 
This, however, should not serve to discourage the application of 
artificial remedies, but should make us cautious in taking too 
much credit to ourselves for the results which follow. 
FRED J. SEAVER. 
THE RE-DISCOVERY OF FISSIDENS DONNELLITI 
AUSTIN 
(WITH PLATE 233) 
It gives me much pleasure to be able to contribute some addi- 
tional information on one of our rarest species of mosses, espe- 
cially since the ninctieth birthday of Capt. John Donnell Smith, 
for whom the species was named, was celebrated June 5 by all 
American botanists, who have gladly acknowledged their in- 
debtedness to his zeal and inspiration. 
Fissidens Donnellii has at last been found in fruit by Mr. 
Severin Rapp, of Sanford, Florida, to whose systematic search 
we owe so many interesting Bryophytes. Austin’s original 
specimens bore setae, but were without capsules and were col- 
lected at Caloosa in 1878; Mr. Rapp’s specimens are in good 
fruit and extend the range of the species nearly 130 miles farther 
north, They have enabled me to compare critically this species 
With its tropical allies, to reduce to synonymy a Mexican and a 
