DISTRICT OF MASSACHUSETTS, to wit: 

 District Clerk's Office. 



BE IT REMEMBERED, that on the seventeenth day of May, A. D. 

 1830, in th? fifty-fourth year of the Independence of the United States of 

 America, CROCKER & BREWSTER, of the said District, have deposited 

 in this office the title of a book, the right whereof they claim as Proprie- 

 tors, in the words following, to wit: 



" Conversations on Vegetable Physiology ; Comprehending the Elements 

 of Botany, with their Application to Agriculture, by the author of" Con- 

 versations on Chemistry," and " Natural Philosophy." Adapted to the 

 use of Schools, by Rev. J. L. Blake." 



In conformity to the act of the Congress of the United States, entitled, 

 " An act for the encouragement of learning, by securing the copies of 

 maps, charts and books, to the Authors and Proprietors of such copies, 

 during the times therein mentioned;" and also to an act, entitled, " An 

 act supplementary to an act, entitled, An act for the encouragement of 

 learning, by securing the copies of maps, charts and books, to the authors 

 and proprietors of such copies during the times therein mentioned; and 

 extending the benefits thereof to the arts of designing, engraving, and 

 etching historical, and other prints." 



JOHN W. DAVIS, 

 Clerk of the District of Massachusetts. 



" We transfer to Messrs. CAREY & HART, all our interest in the 

 within named work." Signed, CROCKER & BREWSTER. 



i, June 27, 1833. 



