Vol. XXI, pp. 11-18 January 23, 1908 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 





DATES OF THE SIGNATURES OF THE " MEMOIRES 

 DE L'ACADEMIE IMPERIALE DES SCIENCES DE 

 SAINT-PETERSBOURG. SERIES VI. SCIENCES MATH- 

 EM A TIQUES, PHYSIQUES ET NATURELLES." 



BY P. L. RICKEE. 



A few years ago the author found it necessary to determine 

 the exact dates of publication of several of the botanical parts 

 of the above series. Original signatures of a number of these 

 parts were found in the various Washington libraries, in green 

 covers with the month of publication printed on the inside of 

 the front cover, indicating that some of the parts at least were 

 published from one to five years before the date on the title 

 page of the bound volume. 



The results of extensive search show that covers to only about 

 half of the signatures of this series are apparently available in 

 this country. The private library of Mr. A. S. Hitchcock 

 assisted in some instances, and on his visit to the St. Petersburg 

 Academy in 1902 he secured the assistance of Mr. D.I. Litwi- 

 now, curator of the Botanical Museum of the Academy, in an 

 effort to complete the missing dates ; but he was unable to get 

 any additional dates from the Academy records or sets. As a 

 last resort, Mr. B. B. Woodward, of the British Museum of 

 Natural History, who has done considerable work of this nature, 

 was appealed to, and to him and the British Museum authori- 

 ties, who have preserved all of their signature covers of this 

 series with dates of receipt of many of them, thanks are here 

 extended for valuable assistance in completing the dates and 

 verifying all of those obtained by the author. 



2— Proo. Biol. Soc. Wash., Vol. XXI, 1908. (11) 



