326 
ANNALS NEW YORK ACADEMY OF SCIENCES 
In general the two factors, change of temperature and change of concen¬ 
tration, will act simultaneously to effect the irregularities considered. 
The paper by Professor Stevenson has been published as pages 161-204 
of this volume. 
The paper by Dr. Girty has been published as pages 135-147 of this 
volume. 
The Section then adjourned. 
Charles P. Berkey, 
Secretary. 
SECTION OF BIOLOGY. 
December 13, 1909. 
Section met at 8:15 p. m., Vice-President Chapman presiding. 
The minutes of the last meeting of the Section were read and approved. 
The following programme was then offered: 
C. William Beebe, Notes of an Ornithologist in Soutpi America. 
A. J. Goldfarb, The Influence of tile Nervous System in Regen¬ 
eration. 
Summary of Papers. 
Mr. Beebe gave an account of three expeditions to the forest regions of 
British Guiana, South America, for the purpose of studying and collecting 
the rarer birds of that locality. Many admirable photographs were shown 
of rare birds, among them the first photographs ever taken of the hoctyui, 
the female being shown in her characteristic crouching attitude near the nest 
and a flock of eleven in one tree. Incidentally some remarkable photographs 
of mammals were obtained, among them one showing six capybaras and 
several young on a river bank taken by Dr. Hiram Bingham and one of a 
manatee swimming with mouth and nostrils just above the water. 
Air. Goldfarb briefly reviewed the suggestions that had heretofore been 
made to account for the fact that some animals were able to replace a missing 
organ, while others were unable to do so. A concise summary was then 
given of the experimental data that supported the conclusion that regenera¬ 
tion was dependent upon a stimulus exerted by or through the central 
nervous system. 
