Biologie. — Cytologie u. Befruchtung. 295 



distant past between P. acaiilis and P. veris. He also suggests 

 that the inter-relations of these Primulas may be similar to 

 those of the forms of the fruticose RiibL w, C. Worsdell. 



Willis, J. C. and Burkill, J. H., „Flowers and Insects in 

 Great Britain. Part II: Observations on the Na- 

 tural Orders Dipsaceae , Pliimbaginaceae , Compositae, 

 Umbelllferae and Coniaceae, made in the Clova Moun- 

 tains." (Annais of Botany. Vol. XVII. March 1903. 

 No. 66.) 



By means of tables, recording counts of the number of 

 insects beionging to the different groups, which were observed 

 to Visit the members of the various Orders of plants named 

 above, the „desirability" of the various insect-groups to the 

 different types of flower found in the respective Orders is exhi- 

 bited. Other fables, contrasting these results with those obtained 

 at other European stations, are given. 



The observations (made between 1894 and 1899) are inten- 

 ded ,,to form a contribution to the study, of the problem of 

 the composition, distribution, and origin of the flora of the 

 Clova region and its interdependance with those of the insect- 

 fauna". W. C. Worsdell. 



Willis, J. C. and Burkill, J. H., „Flowers and Insects in 

 Great Britain. Part 1 11. Ob s ervati o ns on the most 

 specialised Flowers of the Clova Mountains." 

 (Ännals of Botany. Vol. XVII. june 1903, No. 67.) 



As in the last paper, elaborate descriptions, summarised 

 in a table^ exhibit the „desirability" of the various Lepidop- 

 tera and bees to the different types (both as regards form 

 Position, and colour) of the flowers which are specially 

 adapted to the visits of these classes of insects. 



Other tables shew the seasonabie distribution and the 

 tongue length of bees, while a final one contrasts the obser- 

 vations made at Clova v/ith those recorded by other botanists 

 at other European stations. W. C. Worsdell. 



HOFFMÄNN, M., Die Zelle als s e 1 e c t i v e s Merkmal in der 

 Rübenzucht. (Blätter für Zuckerrübenbau. 1903. No. 13.) 



Es werden die Ergebnisse mitgeteilt, welche man bei 

 Zuckerrübenzüchtung mit der Auslese nach Zellbau gewonnen 

 hat. Man wollte von dem stärkeren Ueberwiegen langgestreckter 

 Zellen in der Nachbarschaft der Gefässbündel (Zuckerscheiden) 

 auf den Zuckergehalt schliessen und derart die Befunde von 

 Decaisne, Wiesner und de V r i e s verwenden. Die Schnitte 

 wurden dat)ei in der Schwanzspitze hergestellt, das centrale 

 Gefässbündelsystem mit den angrenzenden Gewebspartien, der 

 sogenannte Stern, zum Vergleich herangezogen. Sov/ohl in 



