NATURAL SCIENCES OF PHILADELPHIA. 
15 
rosin is found in masses as large as a nut, sometimes in veins. It is 
from a tertiary formation. 
Mr. Lea has a specimen of rosin which Sir Henry De La Beche had 
sent him; it was found with coal in Borneo, and is as large as a hickory 
out. 
March 30. 
V"ice-President Bridges in the Chair. 
Fifty-eight members present. 
The committees on Dr. Wilcocks' paper, on Messrs. Meek and Hay- 
den's paper, read March 2nd ; on Mr. Stimpson's paper, on Dr. Leidy's 
paper read March 9th, on Dr. LeConte's paper, on Mr. TJhler's paper 
read March 16th ; on two papers by Mr. Lea, read March 23d j seve- 
rally reported in favor of their publication in the Proceedings, and the 
reports were adopted. 
The amendments to the By-laws proposed January 26, and succes- 
sively passed to second and third reading, were unanimously adopted 
as follows : 
CHAPTER XIII. 
ON THE CREATION AND GOVERNMENT OF DEPARTMENTS. 
Art. I. To facilitate and encourage the special investigation 
of certain branches of natural science, the members of the 
Academy may form Departments, and hold meetings in the 
Hall, distinct and separate from the general meetings of the 
Academy. Th^ Departments shall be A, B, C, D, E, &c., and 
may be constituted and designated in the manner herein pro- 
vided. The Department earliest established, shall have prece-. 
dence of every one subsequently formed. 
Art. II. Any twelve or greater number of members of this 
Academy, may be constituted a division or department, which 
shall be called the Department of the Academy of 
Natural Sciences of Philadelphia, as provided in the third article 
of this chapter. 
Art. III. Whenever members associate to form a department 
or branch, written application shall be made to the Academy, at 
a meeting for business, in the following words : The undersigned 
members request that they may be constituted the 
Department of the Academy of Natural Sciences of Philadel- 
phia. [Note -The blank is to be filled with the name of the 
branch of natural sciences to which the petitioners propose to 
devote themselves.] 
1858.] 
