608 Mosses. (June, 
Summing up the facts of geographical distribution, as the spe- 
cies are now understood, we have two entirely distinct groups of 
these mollusks which, in general terms, may be said to be governed 
in distribution by geographical features, and two of them—one 
of the two being doubtful—appearing common to the two areas; 
Campeloma decisum has the northernmost range, and Campeloma 
ponderosum the southernmost. Further collections are yet needed 
to fix definitely the range of the several species, and to properly 
define their specific relationship. 
It might be added, in concluding this note, that these neglected 
mollusks promise a rich reward for him who shall study them 
anatomically. Their life-history is entirely unknown; the limits 
of the species poorly understood and thus far often misintet- 
preted; and what is important from a purely zoological sta 
point, their geographical distribution and the influence of envi- 
ronment need careful elaboration. 
302 
MOSSES. 
BY PROFESSOR W. W. BAILEY. 
Mo have always had a peculiar attraction for certain stu- 
dents, yet there are comparatively few who study them. m 
ordinary school or even college courses of botany they are 9a y 
mentioned. Indeed, the study of Cryptogams, or flowerless 
plants, is by far too much neglected. Ferns, it is true, have many 
votaries, scientific and amateur, but one rarely hears of any but a 
specialist engaged in the examination of mosses, lichens, or fang! 
Algz have been more fortunate, and have always excited more or 
less popular interest. 
It is, undoubtedly, the difficulty attending the study © 
that has caused them to be so much neglected. One 
rather expert with the microscope to accomplish much 
investigation. This entails expense, but after all not so m 
that many persons of fair means might indulge in the purs™ Pe 
good microscope, with its appurtenances, is to-day within a 
reach of any who care to husband their resources for a while were. 
the object of securing one. I must say, however, in pr 
any purchaser who is himself unfamiliar with the instru 
f mosses 
in their 
uch but 
must be — 
wa 
ing, tat 
i T aea ole tae Say da e EASA a Se ea PDE A a e a E ae ee T 
