I propose to publish additional supplements to both the Musci 
;md Hepatic.e EssiccatiE which I have issued, as fast as I can 
ikccumulate the needed specimens. The supplements to com- 
prise 100 sets of 10-50 specimens each; and I take this op- 
portunity to cordially invite the co-operation of all American 
botanists. 
Liberal allowance will be made and due credit given, for 
100 good specimens of any desired moss or hepatica. 
Except in rare mosses and those difficalt to obtain, the 
specimens should be large and ample. 
Musci should be collected as soon as or a little before 
the capsule matures, while the operculum is yet present. Some 
species seldom or never fruit with us; these should not be neg- 
lected. HepaticsE in general are best collected late in the fall, 
during the winter, or in early spring. — The Jungermaniie about 
the time or a little before they send up the fruit-stalk. All are 
best collected before they shed their spores. 
COE F. AUSTIN. 
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