316 Agricultur. — Horticultur. — Forstbotanik. 



GÜNZEL, F. V., Der Saazer Hopfen 1904. (v. Günzel, 

 Saaz. 322 pp. 22 Schwarz-, 6 Buntdrucktafeln und Text- 

 abbildungen.) 



Bei Besprecliung der Cultur des Hopfens {Hnmiiliis Lupiiliis), des 

 Handels, der Statistik, der Förderungsmaassnahmen sind entsprechend 

 dem Titel des Buches nur Saazer Verhältnisse berücksichtigt. Die 

 Erörterung über die Cultur sind von vielen gut gewählten Abbildungen 

 begleitet." Die eingehende und durch viele farbigen Abbildungen unter- 

 stützte Besprechung der Schädlinge des Hopfens ist allgemein ver- 

 wendbar. Botanisches über den Hopfen (seinen äusseren und inneren 

 Bau, seine Rassen etc.) findet sich nur in den Ausführungen „die vor- 

 zügliche Qualität des Saazer Hopfens" gestreift. Fruwirth. 



Harrison, T. B., Results of recent experiments witli 

 seedling canes and manurial experiments in 

 British Guiana. (West Indian Bulletin. Vol. V. 1905. 

 p. 335—357.) 



The author summarizes in this paper the experimental work carried 

 on with sugar-canes in British Guiana during the period, January 

 1900 to December 1904. The total area in sugar cane has averaged 

 75,535 acres per anuum, of which the average area in Bourbon cane has 

 been 64,693 acres. Of the other older varieties of cane white Trans- 

 parent has been grown to the extent of 2,337 acres per annum, but no 

 other to any considerable degree. 



Since 1900 about 300 000 seedling canes have been raised^ from 

 which 26000 were selected for field experiments. 



Some 50 varieties from these have been chosen by planters as of 

 possible value as sugar producers and of these 50, „some dozen or so 

 show promise of being of actual value agriculturally as producers of 

 Sugar." 



The System of selection of the seedling canes practised at the 

 experiment Station is described in detail. 



The main stages are: 



1. Selection of parent varieties for seed producers. 



2. Selection of the more vigorous seedlings for propagation in the 

 field. 



3. Selection of varieties in the field by cultural characteristics. 



4. Selection from (3) by analytical characters. 



5. 6 and 7. Selections from successive generations on cultural and 

 analytical characters, with special reference to the particular 

 requirements to suit local conditions. 



The preliminary selections in small plots are followed by tests carried 

 out on a large scale on estates. The following table shows the results 

 obtained between 1900 and 1905^ on plots not less than one acre, and 

 repeated on not less than six estates. 



\T • i. Tons of commercial d„,,..k^,, lon 



Varietv. Bourbon ^= lUU. 



•' sugar per acre. 



D. 625 2.50 135.8 



D. 95 2.02 109.7 



Scaly 1.96 106.1 



D. 145 1.95 105.9 



D. 109 1.93 104.3 



B. 147 1.S6 101.6 



Bourbon 1.84 100 



D. 74 1.72 93.5 



White Transparent 1 66 90.2 



D. 78 1.49 80.9 



D. = Demerara seedling. 



B. = Barbados seedling. 



