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ANNALS NEW YORK ACADEMY OF SCIENCES 
SECTION OF BIOLOGY. 
October 11, 1909. 
Section met at 8:15 p. m., Professor N. L. Britton presiding in the absence 
of Vice-President Chapman. 
The minutes of the last meeting of the Section were read and approved. 
The following programme was then offered: 
Miss Nina L. Marshall, Common Mushrooms and How to Know Them. 
Miss Marshall, who is the author of a popular book on mushrooms, 
exhibited a series of beautifully colored slides illustrating the principal types 
of mushrooms. She dwelt especially on the ecology of the different forms 
and on their economic importance, to man. 
The Section then adjourned. 
L. Hussakof, 
Secretary. 
SECTION OF ASTRONOMY, PHYSICS AND CHEMISTRY. 
October 18, 1909. 
Section met at 8:15 P. M., Professor Hering presiding. 
The minutes of the last meeting of the Section were read and approved. 
Prof. J. F. Kemp moved and Dr. C. C. Trowbridge seconded the nomi¬ 
nation of Prof. W. Campbell for Vice-President of the Academy and Chair¬ 
man of the Section. Carried. 
The following programme was then offered: 
Edward Thatcher, Some Principles of Art Metal Work. 
William Campbell, On the Structure and Constitltion of Alloys 
and Metals used in the Arts. 
D. W. Hering, Wave Length of Light by Newton’s Rings. 
Summary of Papers. 
Air. Thatcher gave an outline of the methods followed in Art Aletal Work 
at Teacher’s College, Columbia University. Starting with the making of a 
