MEDICINAL PLANTS 162I 



It appears from these results that artificial manure considerablj- in- 

 creased the yield in nearlj- ever}- case without causing an}- depreciation 

 of quality. 



The average amounts of bitter substances in the dry matter are : 



Plot per cent 



1 17-24 



11 17-33 



III 17.28 



I^' 17-05 



Thus no average increase in bitter substances is evident. 



If, however, the individual experiments are considered it is found that 

 the plots come in the order III, II, IV, I with regard to the amount of hitter 

 substances they contain. In type and size of the strobiles the order is plot III, 

 IV, II, I ; in lupulin content, plot IV, III, I, II ; in colour of the hops plot 

 II, I, III, IV. ' • 



To sum up, from the point of view of quality plot III has given the best 

 result seven times and plot IV five times, the other two plots never taking 

 the first place. The conclusion may be drawn that the quality has been 

 mo.st improved on plot III. It is closely followed b}- plot IV, which comes 

 second simply because the foliage of the plants was more luxuriant than 

 on plot III. 



1 183 - Preliminary Work at the Chemical Laboratory of the Soukhoum Experiment 



Station, Caucasus, on the Extraction of Medical Substances from Local Plants 



(Eucalyptus, Wild Mint, Camphor, Castor Oil, etc.). — Koa.-ioBt M. H. (Kozlov 



M. N.), UrpHOJiopchoe L'e.ihChoc Xosffvonao (The Agriculture of the Coast of the 



Black Sea), Year XIII, No. i, 2, pp. 20-39. Soukhum, Ian. -Feb. 1916. 



Numerous observations made by the Acclimatization Section of the 



Soukhoum Station have shown that it is quite practicable to cultivate 



species of F.ucalyptus, rich in essential oils, on the Batum coast. The first 



attempt to extract these oils was successful!}- made in 1899-1900 by 



Beklemichev at his essential oil factor5^ but after his death the work 



was not carried on. 



In order to throw fiu-ther light on this question, investigations have 

 been made on the leaves and stems of the following species : Eucalyptus 

 Globulus, E. Maideni, E. umygdalina, E. viminalis, E. pulverulenta, E. cre- 

 bra and others. 



The quantity of essential oil in the eucaij-ptus is greatest in the spring 

 and early summer. Beklemichev's researches showed that in vSeptember 

 0.8 per cent of oil was extracted from E. Globulus, 0.7 per cent in Decem- 

 ber, and 0.9 per cent in March. Tests made in September with E. vimi- 

 nalis gave 0.6 per cent, instead of 0.7 per cent ; similar results were obtained 

 with E. pulverulenta, which yield 1.8 per cent instead of 2.2 per cent. Fresh 



