CURRENT LITERATURE 
MINOR NOTICES 
Handbook of Yosemite National Park.—Hatt' has edited a volume of 
information in reference to Yosemite National Park. He has also written the 
chapter on trees, but the volume is really the combined product of more than 
a dozen specialists, and appears to be decidedly superior to the handbooks 
usually available for the guidance of travelers. The ideas sa policy of 
actuating the best minds of the nation in the creation, administration, and use 
of such parks are admirably set forth by SrEPHEN T. MaTHER, Directo United 
States National Park Service. 
Several professors of the University of California have contributed chap- 
ters on their own subjects, KROEBER dealing with the anthropology, LAwsoNn 
with the geology, GRINNELL with the animal life and its distribution according 
to life zones, VAN DvkE with the insects, and Jepson with the plant life. All 
these accounts are in attractive style and are scientifically accurate. JEPSON’S 
chapter on the Sequoia seems to be particularly happy in presenting the life 
problems of these great trees in attractive and accurate form. His treatment 
of the wild flowers is based upon ecological principles, and here, in common 
with the other chapters of the book, there is appended a sufficient bibliography 
to lead the interested traveler or student into the available literature upon 
the subject —Gro. D. Futter 
Plant analysis.—Stechert and Company have recently republished GREEN- 
IsH’s translation of DRracENDoRrF’s Plant analysis, qualitative and quanti- 
tative.2—W™. CROCKER. 
NOTES FOR STUDENTS 
-Mutation.—For the past two decades the term mutation has held a very 
prominent place in the vocabulary and thought of biologists, yet most of us 
have had a very inexact understanding of the phenomena involved. Even 
now an understanding of the causes is probably quite remote, but at least our 
* Hatt, ANSELL T., Handbook of Yosemite National Park. 12 mo. pp. ix+347- 
pls. 27 and map. New York: Putman’s Sons. 1921. $2.5 
2 Dracenvorr, G., Plant analysis, qualitative and quantitative. pp. Bt ig 
Translated by Henry G. GREENISH. 1883. 
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