COLUMBIA UNIVERSITY LIBRARIES

This ЫК iB due оп the date indicated below, or Bt

expiration 01 а deanite after the date 01 borroving,

ав provided by the rulu of the Libmry or by B*al ar-

mngement with the Librarian in chuge.

ВАТЕ BORROWED

ПАТЕ DUE

520

ПТЕ вОПОикО

ВАТЕ