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, MONTH FROM APRIL TO JUNE. UNIVERSITY OF CALIFORNIA PRESS BERKELEY, CALIFORNIA |