MAR 6 = 190 
SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 724 
The summary of their results are as follows: 
These reults, while unsatisfactory, show clearly that it is the hard 
seeds in the clovers which remain over in the soil for some considerable 
time. The alsike clover, No. 50, behaved practically the same as the 
sample of red clover first mentioned. The Lespedeza, or bush clover, 
No. 43, gave results very similar to the white clover. The alfalfa, No. 
59, gave a germination of only 2, 9, and 9 per cent, respectively, for the 
different depths. But in all cases a few fresh sprouts were present 
when the seeds were taken up, showing that the seeds were germinating 
and afterwards decaying. 
The length of time that seeds will retain their vitality when buried 
in the soil is of much importance in the extermination of weeds. 
The seeds of many of our pernicious weeds can be destroyed by 
deep plowing, if the soil is left undisturbed for some time. 
NEW SHELLS. 
Two new varieties of Credidula rugosa. Nutt. Are described by 
Mis. M. Barton, in ‘‘The Nautilus,’’ Sept. 1, 1905. 
PUBLICATIONS RECHIVED. 
‘*‘Annals of the Carnegie Museum.’’ Vol. III, No. 3. 
““Commercial Fertilizers,’’ by G. Roberts. University ot California. 
Bulletin No. 171. 
‘*Studies in Grasshopper Control,’’ by J. S. Hunter. . University of 
‘California. Bulletin No. 170. 
‘“‘The Mexican Cotton Ball Weevil.’’ U. S. Dept. of Agriculture. 
Entomology Bulletin No. 51. 
“*Root-Maggots and How to Control Them.’’ U.S. Dept. of Agri- 
eulture. Circular No. 63. 
“*Manufacture of Dry Wines in Hot Countries,’’ by F. T. Bioletti. 
University of California. Agricultural Bulletin No. 167. 
‘“‘Memoirs of the Carnegie Museum.’’ Vol. II, Nos. 2 to 5. 
RECENT LITERATURE. 
The Butterflies of the west coast of the United States. By William 
Greenwood Wright. Pp. 257. VII Pl. 1-32 Whitaker & Ray Co., San 
Francisco, 1905. 
California has every reason to be proud of this handsome quarto. 
The neat binding, the broad-margined page, the paper and the press- 
work, characterize it as a worthy example of good bookmaking, while 
the plates represent the highest attainment of the art of photographie 
color-printing. It is not too much to say of them, that they equal in 
beauty, and excel in accuracy, the hand-colored photos of Erward’s 
great work. 
In interest and importance the contents are worthy of their fine 
dress. For twenty-five years the author kas been a diligent student. of 
the lepidoptera of western America. He has studied them in the field 
from Alaska to Mexico, so that he has come to know intimately almost 
every species and form that flies in that vast territory. Naturally the 
work of such a student, and in a field so little explored, is full of original 
and valuable matter. And science is fortunate that the author has 
recorded in this permanent form so much information that no other 
has aequired. 
The first thirty-two pages are occupied by a discussion of the geu- 
eral features of butterfly life. This is sueceeded by a complete list of 
the butterflies of the United States, with their respective ranges, those 
