LIBRARY 
TRANSACTIONS AND PROCEEDINGS NEW YORE 
OF THE BOTANICAL 
. . » Qs OOEN. 
Botanical Society of Pennsylvania 
VOL. it, NO! Ss: 
PRINTED ON THE MRS. JAMES MCMANES FUND. 
A Comparative Study of the Cytology and 
Movements of the Cyanophyceze. 
(WITH PLATES XXIII-XXV.) 
Thesis presented to the Department of Philosophy, University of Pennsylvania, 
May 1903, in partial fulfilment of requirements for 
the Degree of Doctor of Philosophy. 
Read before the Botanical Society of Pennsylvania, October 18th, 1902, and 
May 15th, 1903.* 
By OrvI tie P. Puituips, M. S., Pu. D. 
The problem of heredity has been attacked from many 
sides. Various theories concerning the transmission of char- 
acteristics, whether acquired or otherwise, have been given 
to the world, and as many have been withdrawn or proven 
untenable, at least by some authorities. From Thales to 
* In view of the recent appearance of three valuable contributions 
to the above subject, it may be stated that Dr. Phillips’ completed 
thesis was placed in my hands on May 3d, 1903, and has been in my 
care since. Its publication has been unavoidably delayed till now, 
but no alterations have been made onit. While the views here set 
forth can claim no priority over those already published, their appear- 
ance may aid in the settlement of disputed points.—J. M. Mac- 
PARLANE, Editor. 
(237) 
