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9 
the National Academy of Sciences to the best of his ability. 
He shall also subscribe the laws of the Academy. 
Sect. 4. The members of the Academy shall be ar- 
ranged in two Classes, according to their special studies, 
viz.: A, the Class of Mathematics and Physics, and B, the 
Class of Natural History. The corporate members may 
select the Class in which they desire to be arranged. 
Secor. 5.* The members of the Classes shall arrange 
themselves in Sections, by inscribing their names under one 
of the following heads: —~ Crass A. Mathematics and Phys- 
tes. Sections: 1. Mathematics; 2. Physics; 3. Astron- 
omy, Geography, and Geodesy; 4. Mechanics ; 5. Chemistry 
and Mineralogy. Crass B. Natural History. Sections: 1. 
Geology and Paleontology; 2. Zodlogy; 3. Botany; 4. 
Anatomy and Physiology; 5. Ethnology and Philology. 
But the Academy retains the power of transferring a 
member from one Section to another by a unanimous yote.. 
Secr. 6.+ A member of any Section may be elected 
& member of any one other Section by a vote of a majority 
of the members thereof present, subject to the approval of 
the Academy, but shall thereby acquire no new right of 
Voting as a member of a Class. 
The Academy may also, by a vote of three fourths of the 
Members present, appoint a member of any Section a mem- 
ber of any one other Section which is unable to elect for 
itself. Such member shall acquire no new right of voting 
48 a member of a Class. 
Secr. 7. The Academy may elect fifty Foreign Asso- 
Ciates, who shall have the privilege of attending the meet- 
ings of the Academy, and of reading and communicating 
; -* Amended January 4, 1865; January 24, 1866, and January 24, 
1867. 
_ t Amended August 25, 1865. 
