ANNALS 



OF THE 



NEW YORK ACADEMY OF SCIENCES. 



VOLUME VI, 1891-92. 



The "Annals," published for over half a century by the Lyceum of 

 Natural History, are continued under the above name by the New York 

 Academy of Sciences, beginning in 1877. Five volumes of the new series 

 have now been issued, each covering three years (1877-9, 1880-2, 1883-5, 

 1886-8, 1889-91, inclusive). 



With the beginning of the fourth volume, the Academy decided to 

 change somewhat the mode of publication. The Annals are henceforth 

 issued without particular reference to times or periods. The parts will 

 appear as material for them shall be offered ; each single part, or number, 

 as before, will contain at least 32 pages, with or without plates ; twelve 

 numbers, as before, whenever published, will constitute a volume. The 

 size and general character of the parts and volumes will not be changed ; 

 nor is it intended at all to reduce the average yearly amount of matter. 



The Annals include the more extended and elaborate papers laid before 

 the Academy. The briefer papers and discussions that form part of the 

 Academy's meetings appear in its other publication, the Transactions, 

 which it is designed to issue promptly and regularly, so as to give a 

 record of the current work of each year, — the single numbers appearing 

 monthly (or double, bi-monthly), and eight single numbers forming an 

 annual volume. 



By vote of the Academy, both these publications will be sent free to 

 its Resident and Honorary members. To non-resident members the price 

 of the Transactions will be $3.00 per year. 



To all others, prices will be as follows : 



Annals, single numbers, Fifty Cents. 



" double or triple numbers, in proportion. 



" per volume (12 numbers), .... Six Dollars. 



Transactions, per year, Five Dollars. 



" single numbers, . . . . Fifty Cents. 



All communications should be addressed to 



THOS. L. CASEY, 



Army Building, 

 New York. 

 Or to 



HENRY DUDLEY, Esq., 



Treasurer, No. 56 West 57th Street. 



The Academy has for sale a number of back volumes of the Annals 

 of both series, each containing twelve or more numbers ; the price per 

 volume is Five Dollars in the old (Lyceum) series, and Six Dollars in the 

 new (Academy) series. 



