378 
association. The pebbles resemble to a great 
extent those figured by Dr. Williston some 
years ago aS occurring with a pleisosaur. 
Another, nearly complete skeleton of a large 
shark, Jswrus mantelli Ag., has preserved the 
larger part of the cranial cartilages. The 
sharks will shortly be described in detail and 
further reference need not be made to them 
here. 
Roy L. Moovre 
THE UNIVERSITY OF KANSAS, 
January 26, 1912 
THE WASHINGTON MEETING OF THE 
AMERICAN CHEMICAL SOCIETY! 
THE meetings of the society were held from 
Wednesday, December 27, to Saturday, December 
30. 
On Wednesday morning four papers were pre- 
sented in joint session of the Section of Chemical 
Education and the Division of Physical and In- 
organie Chemistry: 
A. A. NovEs (chairman): The Teaching of Phys- 
ical Chemistry. 
W. D. BANcrorr: Physical Chemistry in the In- 
troductory Course. 
In the introductory course we should include: 
gas law; boiling-point curve; solubility; a brief 
statement of the dissociation theory; qualitative 
mass law, and qualitative catalysis. We should 
exclude: quantitative mass law; dilution law; 
solubility product, and reaction velocity. I am 
doubtful about electrolysis and osmotic pressure; 
but I should include the former and exclude the 
latter. 
H. C. JonES: The Introduction of Physical Chem- 
ical Conceptions in the Early Stages of the 
Teaching of General Chemistry. 
J. Howarp MatHEews: Some Applications of 
Color Photography in the Teaching of Physical 
Chemistry. (Illustrated. ) 
The theory and manipulations of the ‘‘screen- 
plate’’ processes of color photography were de- 
scribed briefly. Numerous scientific applications 
of color photography were pointed out, and each 
application was illustrated by color photographs 
thrown on the screen. The process has been found 
to be exceedingly useful in photographing inter- 
1 Most of these papers will be published in the 
Journal of the American Chemical Society or in 
the Journal of Industrial and Engineering Chem- 
istry. 
SCIENCE 
[N.S. Vou. XXXV. No. 897 
ference figures and in recording the interference 
colors observed when certain crystals are viewed 
in polarized light. In many of the slides illus- 
trating the latter, selenite plates were used to pro- 
duce backgrounds of strong contrast and brilliant 
color. Photographs of ‘‘thin-sections’’ of various 
rocks showing their characteristic appearance in 
polarized light were also shown. The process has 
been found to be particularly well adapted to the 
projection of spectrum charts, ete., in colors. The 
absorption bands of chlorophyll were photographed 
directly in the spectroscope and a fairly accurate 
record obtained. Pure spectrum colors are not 
truly rendered by the process, since the color is 
always dependent on the dyes used to color the 
starch grains. However, an attempt to photograph 
the fluorescence of solutions of fluorescein met 
with considerable success. 
The following three papers were presented in 
general meeting on Wednesday afternoon: 
PRESIDENT FRANKFORTER (Section C): The Resins 
and their Chemical Relations to the Terpenes. 
To be published in ScrIENCE. 
H. P. TAuBor (chairman Division of Physical and 
Inorganic Chemistry): Privileges and Responsi- 
bilities of the Chemical Analyst. 
A. L. VoGE: Ostwald’s Proposed International 
Institute of Chemistry (chiefly bibliography and 
library practise). 
On Thursday evening two addresses were given 
in general session: 
ALEXANDER SMITH (president American Chemical 
Society): An Early Physical Chemist. 
Published in the issue of SclENcE for February 1. 
FRANK B. KENDRICK and H. E. Howe: Lantern 
Experiments on Reactions in Heterogeneous 
Systems. 
A series of lantern illustrations of the effect of 
temperature, pressure, concentration, surface, os- 
motie pressure, etc., on reactions in heterogeneous 
systems. Several adaptations of a Bausch and 
Lomb balopticon were described, including a modi- 
fication of the Topler ‘‘Schlieren’’ apparatus for 
projection and the use of the lantern as a photo- 
graphic camera. 
On Friday a symposium on Mineral Waters was 
held before the Division of Industrial Chemists 
and Chemical Engineers. Titles of papers pre- 
sented before this important symposium were pub- 
lished in ScIENCE of January 12. The papers 
themselves together with the voluminous discussion 
will be featured in the March issue of the Journal 
of Industrial and Engineering Chemistry. 
