Botany and Zoology. 327 
Prof. Tuckerman has shown a wise conservatism with regard to 
the limitation of species, avoiding the excessive multiplications, 
founded on trivial or accidental distinctions, which characterize 
s. No e 
The ee are clear and adequate, without being diffuse, 
and the botanist and student are now in position to determi ine 
0 at experience and protracted cannes car eet on in this 
country, Prof oe in the very beginning of his botanical 
career the onal frie cee and aoa pbs of ee baklaie 
able, so to speak, to transmit to us in this sta the views wer 
the fathers of the science with regard to North American species 
and their relations to European forms. In the case of marine 
alge, Harvey sinkonieaetiel died before any one in this country 
bias really to study that group of plants, and we are left in the 
dark as to many species about which Harvey alone could have 
given information. With the death of Curtis, too, students of 
mination is now uncertain, but which w have — = 
enough to one who had had betty snipe from Cu 
reater part of the more striking Lichens eee ta the 
Pacmoliases and the Cladoniei, the student will find most of the 
forms which he is tien to collect described in this first liga of 
means difficult, cepecils as Prof. Tuckerman is is not given to ex- 
cessive splitting up of species. The family of the @ ollemiei, 
however, must present difficulties even to expe . eems: be us 
the forms present without necessarily commi tting one as to their 
nature. It is to be hoped that — learned author will soon give 
to the public the remainder of the Synopsis, including the very 
difficult Lecidea and Voriaca. cosaie. with which he alone of 
American botanists is able to cope. With the appearance of 
