156 BIOLOGICAL LECTURES. 



raphy of Vertebrate Embryology, which was published by the 

 Boston Society of Natural History in 1893. It contains 3555 

 titles, and it may interest you to know that I have collected 

 since its publication upwards of a thousand titles to be added 

 to it. As this work is intended to result in publication, the 

 results are written out on sheets of paper, each sheet for one 

 subject only ; were it not for publication, I should use cards 

 for the subject catalogue also. 



Let us pass to our main topic, a discussion of the means of 

 looking up the literature of a given subject in the domain of 

 animal morphology or physiology ; in regard to other divisions 

 of the wide territory of biology I am not competent to advise 

 you. We will pass in review : (I) the standard bibliogra- 

 phies ; (II) incidental bibliographies, given in connection with 

 special memoirs, etc. ; (III) current bibliographies, which we 

 can divide into two groups : (A) those appearing annually, and 

 (B) those appearing periodically at intervals of less than a year. 



I. Standard Bibliographies. The purpose and character 

 of these is so evident that it is only necessary to enumerate 

 them. They are : 



1. W. ENGELMANN. Bibliotheca historico-naturalis . i vol. 

 8vo. Leipzig, 1846. Covers the literature of 1700-1846. 



2. CARUS und ENGELMANN. Bibliotheca zoologica. 2 vols. 

 8vo. 1 86 1. Covers the years of 1846-1860. 



3. TASCHENBERG. Bibliotheca zoologica II. Twelve parts, 

 with pages 1-3888, have been issued, the mammals not being 

 yet reached. It is the continuation of Carus and Engelmann. 



4. HAGEN. Bibliotheca entomologica. Die Literatur iiber 

 das ganze Gebiet der Entomologie bis zum Jahre 1862. 2 vols. 

 8vo. 1862. 



5. MINOT. Bibliography of Vertebrate Embryology. 4to. 

 Boston Society of Natural History. 1893. 



Important help in finding a paper, when the author is known, 

 is given by the Catalogue of Scientific Papers, issued by the 

 Royal Society of London, in spite of the enormous number of 

 its omissions. This catalogue comprises, in all, three series of 



