Pflanzenchemie. — Angewandte Botanik. 239 



daher als wahrscheinlich, dass in einigen Pflanzenarten neben dem, 

 •tti Hexylenaldehyd noch ein zweiter Aldehyd vorkommt, über den 

 sie später ausführlich berichten werden. 



Der itß Hexylenaldehyd und die Glukose stimmen darin über- 

 ein, dass sie beide das gleiche KohlenstoÖskelett und die Aldehyd- 

 gruppe besitzen. Es liegt also die Annahme nahe, dass beide auch 

 in genetischem Zusammenhange stehen. Ob der nß Hexylenaldehyd 

 ein Nebenprodukt der Zuckersynthese ist, oder ob die Pflanze bei 

 dieser Synthese den Umweg über die besagte chemische Verbindung 

 einschlägt, darüber sollen spätere Untersuchungen der Verf. Aus- 

 kunft geben. O. Damm. 



Bolley, H. L., The Destruction of Weeds in Field Crops 

 by means of Chemical Sprays. (Rept. brit. Ass. Sc. Winnipeg, 

 Sekt. K, p. 676—677. 1909.) 



The author advocates a great extension of spraying for the 

 control of fungi and weeds, extending it to all the farm crops. 

 Exact investigations are required to be carried out on a scientific 

 basis, so that the work may be taken beyond the slow process of 

 development and isolated trials which have characterised it in the 

 past. A number of lines of investigation are suggested. 



W. G. Smith. 



Cook, O. F., Cotton selection on the farm by the charac- 

 ters of the stalks, leaves and boUs. (Giro. N^. 66, Bur. Plant 

 Ind. U. S. Dept. Agr. p. 23. 1910.) 



The writer emphasises the fact that, owing to the extreme 

 susceptibility of the cotton plant to influences of soil and climate,. 

 continued selection in every generation is necessary to keep a 

 variety uniform. By a study of the vegetative characters of the 

 stalks i^ leaves and bolls, the undesirable variants, which will produce 

 lint of inferior quality or in lessened quantity, may be removed 

 before the lime of flowering and thus, by preventing their crossing, 

 lessen the chances of their reappearance in the next generation. 



Gates. 



Forbes, A.C., Some features of bavarian Forestry. (Journ. 

 Dept. Agric. Ireland. X. 3. p. 477—484. ill. 1910.) 



This useful paper contains the observations of a leading british 

 forester on Bavaria, a country with a fully developed forest area. 

 About 34 p.cent. of the total land surface is forest, 50 p.c. of which 

 is owned privately, the remainder being divided between State 

 (36 p.c.) and other bodies. The production of timber has increased 

 considerably within the past 30 years, both in yield and value. 

 Spruce (Picea) Stands first amongst the trees, but Scots Pine (Pimts) 

 and Silver Fir ' Ab/'e.'^) are important. There is a useful sketch of 

 the Spessart Oak forest, and its treatment The economic conditions 

 of forestry are also discussed, and some details of the System for 

 educatioa'of foresters are given. Comparisons are also made between 

 what bavarian forestry is, and what 'rish forestry might be. The 

 photographs show representative timber trees in the forest. 



W. G. Smith. 



Tunmann, O. , Bemerkungen über einige Kryptogamen- 



