22 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 
TRANSACTIONS FOR JANUARY, 1905 
I. ACADEMY SESSION, JANUARY 2. 
(Owing to the Holiday season, the lecture set for this evening was 
postponed to the first Monday in February, by vote of the members 
present.) 
II. MEETING OF DIRECTORS. 
(The minutes of the Board meeting in January were published in 
the preceding number of the Bulletin.) 
III. MEETINGS OF SECTIONS. 
1. Section of Biology. 
Meeting held January 9, 1905. 
Owing to the unavoidable absence of the Chairman of the Section, 
Professor Dozier called the meeting to order and presided during its ses- 
sion. The minutes of the last meeting were read and approved. The lec- 
ture of the evening, delivered by Dr. Leonard, City Bacteriologist, was of 
such unusual interest that we shall try to present a comprehensive outline 
of it in The Bulletin. An extremely interesting feature of the evening 
was the opportunity to examine pathological preparations furnished by Dr. 
Leonard. This was done by means of microscopes loaned by the Pacific 
College of Osteopathy. 
The February meeting of the Section’ will be addressed by Dr. Edith 
Claypole, her subject being ‘‘The Present Aspect of Cellular Chemistry.’’ 
About thirty-five members and visitors attended this meeting. 
C. A. WHITING, Secretary. 
2. Section of Astronomy. 
The January meeting was held at the State Normal School on the 
16th, Chairman W. H. Knight presiding. 
The chief topic of discussion was Jupiter and its satellites, with kin- 
dred subjects suggested by this. Myr. Knight read an article descriptive 
of the recent discovery at the Lick Observatory of the sixth moon of 
Jupiter, by Prof. Perrine of that institution. The result was secured 
through photography by means of a new and superior photographie appa- 
ratus furnished by the liberality of Mrs. Phoebe Hearst. 
All the facts relative to the distance, size and motion of this newly 
discovered body cannot be determined until further observations have 
been made; but it is suspected that the revolutionary motion is contrary 
to that of the other satellites of Jupiter. 
By blackboard illustration Mr. Knight explained a somewhat com- 
monly accepted theory, accounting for the counter revolution of a satellite 
as a consequence of its counter rotation, 
Mr. Knight, however, questioned the correctness of this theory, and 
advanced in its stead the more plausible one that the supposed satellite 
is a comet captured by the attractive force of the giant planet, whose 
motion when drawn into the grasp of this great central body was con- 
trary to that of its satellites. 
Mr. Knight then proceeded to give a historic account of the discovery 
of the four moons of Jupiter by Galileo and of the development of the 
knowledge of the planetary system, showing with what reluctance the 
people accepted announced changes in what was long regarded as settled 
