75 



HOW TO OBTAIN ENTOMOLOGICAL BOOKS AND PAMPHLETS. 



Comparatively few of the works treating of the classification of North 

 American insects have been published as separate books ; but such as 

 have been so published, if of comparatively recent date, can be obtained 

 through the regular book trade. By far the greater number of the 

 monographs and synopses mentioned in the preceding pages have 

 been published in scientific periodicals and transactions of scientific 

 societies. Thse periodicals and transactions can be obtained through 

 the societies which publish them and through the publishers; but> 

 in the case of transactions, single volumes, and more especially single 

 papers, are seldom sold, and the older volumes are liable to be out 

 of print. Moreover the expense attending the purchase of all of the 

 periodicals containing the publications on a given order of insects will 

 be so great as to put them beyond the reach of most entomologists. 

 The custom of placing at the disposal of authors a number of separate 

 copies of their papers overcomes this difficulty to some extent and cre- 

 ates a small supply. Thus it often happens that a person interested 

 can obtain a copy of a scientific paper by addressing the author person- 

 ally. Many of these separate copies also get into the possession of 

 dealers in second-hand books, and can be purchased from them. The 

 American Entomological Society of Philadelphia and also a few other 

 societies here and in Europe offer for sale from their duplicates many 

 of these authors' extras, and in some cases publish lists. There are, 

 moreover, certain business establishments which make a specialty of 

 the sale of works and pamphlets on Natural History, including Ento- 

 mology, and it is chiefly through such establishments that the student 

 is enabled to secure the larger portion of the works needed. In Amer- 

 ica there is at present but one of these special dealers of any promi- 

 nence, viz, Dr. A. E. Foote, of 1223 Belmont avenue, Philadelphia, Pa. 

 But in Europe there are several of considerable reputation ; among these 

 we may mention: 



B. Friedlaender & Sohn, Oarlstrasse, 11, Berlin, Germany. 



Ed. Andr6, 21 Boulevard Bretonnifere, Beaune (Gdte-d'Or), Prance. 



H. W. Schmidt, Eannische Strasse, Nr. 1, Halle a. S, Germany. 



J. B. Baillifere et fils, 19, Rue Hautefeuille, Paris, France. 



Oswald Weigel, Konigsstrasse, 1, Leipzig, Germany. 



TJ. Hoepli, Corso Vitt. Em an., 37, Milan, Italy. 



Otto Harrassowitz, Querstrasse, 14, Leipzig, Germany. 



William Wesley & Son, 28 Essex street. Strand, London, England. 



All of these firms publish catalogues, and in writing to them the ento- 

 mological catalogue should be especially asked for. There are two firms 

 in New York which act as agents for all of these houses, and works can 

 be ordered through them or catalogues obtained from them. These are 



