THIRD SERIES. Vol. XXI, No. 6

INTERSESSION

May 21 to June 30

AND

SUMMER SESSION

July 2 to August 11, 1928

AT BERKELEY

DECEMBER, 1927

UNIVERSITY OF CALIFORNIA BULLETIN

A SERIES IN THE ADMINISTRATIVE BULLETINS OF THE UNIVERSITY OF CALI-

FORNIA.

ENTERED JULY 1, 1911, AT THE POST OFFICE AT BERKELEY,
CALIFORNIA, AS SECOND-CLASS MATTER, UNDER THE ACT OF CONGRESS OF
JULY 16, 1894. ISSUED MONTHLY FROM JULY TO MARCH, AND TWICE A

MONTH FROM APRIL TO JUNE.

UNIVERSITY OF CALIFORNIA PRESS

BERKELEY, CALIFORNIA