FLORAL BIOLOGY. 215 



steady fall. The larger insect groups (coleoptera, long- 

 tongued flies, etc.) were treated in a similar way, the 

 number of species of each that visited flowers being noted, 

 but the curves obtained were never so regular, and in 

 some cases went up and down in a most erratic way. 

 It was shown however that the groups of insects have 

 their chief maxima at different times, e.g., the Lepidoptera 

 in July, the short-tongued bees early in the season, and 

 so on. Other papers of the same nature have also been 

 published lately. 



BIBLIOGRAPHY. 



(1) SPRENGEL. Das entdeckte GcJieimniss. Berlin: Mayer and 



Miiller, 1894. 

 LOEW, E. Einfiihrung in d. Bliitenbiologie. Berlin : Dammer, 



1895. 

 LOEW, E. Bliitenbiolog. Floristik. Stuttgart: Enke, 1894. 

 LUDWIG, F. Lehrb. der Pflanzenbiologie. Stuttgart : Enke, 



1895. 

 MacLeod, J. Over de bevruchting der bloemen in het Koupisch 



gedeelte van Vlaanderen. Gent : Vuylsteke ; reprinted from 



Botan. Jaarboek, v., vi., 1893-4. 



(2) Detmer. Keimungsphysiologie. 



(3) V6CHTING in Brings. Jb., 1893. 

 GRAEBNER in Bot. V. Brandenburg, 1894. 

 WiLLIS in Linn. Soc. fourn., 1894. 

 WILLIS in Proc. Camb. Phil. Soc., 1892-4. 



(4) Annals of Bot., July, 1895. 



The literature of this subject is very fully indexed in Muller's 

 Pert, of Firs, (to 1882), in MacLeod's paper in Botan. faarb., 1890 

 (to 1889), and in Loew's book (to 1894), an d other books and papers 

 above mentioned. 



John C. Willis. 



