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and always ready to serve those who needed his services, without money 
and without price; he had many opportunities for pecuniary advance- 
ment, but neglected them. 
He was as careless in such matters as in his dress. Direct and blunt 
of manner, some thought him rough and rude of speech ; he was, never- 
theless, sympathetic and ever ready to lend a helping hand or do a kindly 
deed. He was aman of strong convictions and decided in his opinions. 
He was connected with the Mexican Boundary Survey as Geologist 
of California and the State of Nevada, also State Geologist of California 
in the early fifties. 
He served in the war as Assistant Surgeon of Volunteers. 
LIST OF GEOLOGICAL AND PALA{ONTOLOGICAL PUBLICATIONS: 
Dr. John B. Trask contributed to the California Academy of Sciences 
the following papers: 
1—Description of new species of Naiades from Sacramento River; Proc. 
Cal. Acad. Sci., vol. 1, . 27-20, 1855; Axvodonta Kanda, A. 
triangularis, A. rotundovata, ‘The second paper describes species 
from the Yuba River, A/asmodon yubensis. 
2—Description of Ammonites Batestt,; Proc. Cal. Acad. Sci., vol. 1, p. 
39, 1855. 
3—Description of Fossil Shells; Proc. Cal. Acad. Sci., vol. 1, p. 40, 1855; 
Chemnitzia papillosa, Tornatella elliplica, Murex fragilis, lusus 
Barbarensis, F. robustus, F. rugosus. 
4—Harthquakes in California from 1812 to 1855; Proc. Cal. Acad. Sci., 
VOl, 1, p. 55, 1650, 
5—Descriptions of new species of Ammonite and Baculite from the 
Tertiary rocks of Chico creek; Proc. Cal, Acad; Sci,, vol. 1, p. 92, 
1856; Ammontite Chicoensts, Baculite Chicoensis. 
6—Description of three new species of the genus Plagiostoma from the 
Cretaceous rocks of Los Angeles; Proc. Cal. Acad. Sci., vol. 1, p. 
93, 1856 (plate); Plagiostoma Pedrona, P. annulatus, P. truncata. 
7—On Earthquakes in California in 1856; Proc. Cal. Acad. Sci., vol. 1, 
Pp. 102, 1856. 
8—On the direction and velocity of the Warthquake in California January 
oth, 1857; Proc. Cal, Acad, Sci., vol. 1, p. 109, 1857. 
g—On some new Microscopic Organisms; Proc. Cal. Acad. Sci., vol. 1, 
p. 110, 1857. In which he establishes the new genus Lep/osiagon 
for certain forms attached to Algee of Santa Barbara. 
1o—New species of Zoophytes; Proc. Cal. Acad. Sci., vol. 1, p. 112, 1857. 
In which the author describes nine new species from the Bay of 
San Francisco and adjacent localities. 
t1—Harthquakes in California during the year 1857; Proc. Cal. Acad, 
So1,. Vol, 1, 0. 120, 1956, 
