Agricultur, etc. — Chemisches, etc. 5^1 



Synonyms: (1) A. Schoenanihns Roxb. non L., (2) A. citrattis DC. 

 emend. Nees, (3) A. Roxburghii Nees ex. Steud., (4) A. ceriferus 

 Hack, and (5) A. Nardiis var. ceriferus Hack. The evidence is 

 inconclusive as to its original home; it may be Malaj^an. 



It has been repeatedly pointed out by Schimmel and Co. that 

 the West Indian, West African and Brazilian lemon grass oils are 

 inferior to good East Indian lemon grass oil. This is attributed to 

 the East Indian oil being the produce of C. flexiiosus whilst the other 

 inferior oils are derived from C citratus. 



8. Cymbopogon Martini Stapf. {Adropogon Martini, Roxb.) Gera- 

 nium oil and Rusa oil grass. 



The grass is widely distributed in northern India, but utilized 

 to a comparatively small degree, principall}^ in Khandeish. Two 

 kinds of Rusa oil are distinguished "Motia" and "Sufia", but the 

 accounts concerning them are conflicting, some attributing the 

 different kinds of oil to the age of the plants when cut. Motia oil 

 is the more valuable and it is chiefly this which is exported to 

 Turkey for mixing with oil of roses. 



9. Cymbopogon caesius Stapf. {Andropogon caesius Nees in part.) 

 The oil is not produced commercially. Experiments in the 



Nilgiris gave a yield of oil of 0,43 per cent from fresh grass. The 

 composition of the oil is unknown. 



10. Cymbopogon polynenros Stapf. (Andropogon polyneuros Steud). 

 It occurs in the Nilgiris and Ceylon. No commercial use is 



made of it. Yield of oil 0.25 per cent. 



11. Vetiveria sizanioides Stapf. {Andropogon mnricatus Retz). 

 The well knuwn grass in the tropics known as "Khas-Khas", 



"Khus-Khus" or " Vetiver". The roots emit a fragrant odour especially 

 after being sprinkled with water. Very little oil appears to be 

 distilled in India or elsewhere, such as occurs in Europe being 

 mainly distilled from imported roots. 



12. Andropogon odoratus List. 



A little known grass with a strong odour of ginger. Its vernacular 

 name in India is „Usadhana". The oil has not yet become an 

 article of commerce. There is a plate of Andropogon citratus, and 

 a key to the species enumerated. W. G. Freeman (London.) 



Krüger, W., Über die Bedeutung der Nitrifikation für die 

 Kulturpflanzen. (Landw. Jahrb. XXXIV. p. 761. 1905.) 



Die Arbeit berichtet über eine grosse Zahl von Versuchsreihen, 

 an teils unbestellten, teils mit Sinapis, Avena, Hordeiini, Sola^nmi , 

 Beta (Futterrüben) besäeten Kulturgetässen. Je eine Reihe erhielt 

 a) keine Stickstoffdüngung, b) Ammonsulfat-, c) Salpeterdüngung; 

 je eine Hälfte wurde im Dampftopf sterilisirt. Methodisch war dabei 

 die Erfahrung von grossen Vorteil, dass obige Behandlung, dreimal 

 eine Stunde lang, genügt, um die nitrifizirenden Bakterien abzu- 

 töten, und dass innerhalb von Monaten nur ganz ausnahmsweise 

 sich spontane Nitrifikation einstellt (was mit unserer Kenntnis von 

 der Lebensweise der Nitrobakterien übereinstimmt). 



Für Sinapi?,^ Avena und Hordeum erweissen sich Ammoniak 

 und Salpeter als nahezu gleichwertig; Solanum und Beta stehen 

 sich insofern als Extreme gegenüber, als bei ersterer die Ausnüt- 

 zung des Ammoniaks, bei Beta die des Salpeters beträchtlich gün- 

 stiger war. Wenn sich trotz der Resultate an den vier ersteren 



