- 63 - 



with the one obtained by E. von Meyer and M. Schmidt 1 ). The 

 view then expressed by us finds a welcome confirmation in the results 

 of Freundler's examination. 



In addition to thiophenyl ketotetrahydroquinazoline, Freundler 

 has also produced the picrate of anthranilic acid ester not yet described. 

 It is formed when alcoholic solution of picric acid is mixed with 

 methyl ester of anthranilic acid, and it crystallises in yellow needles 

 which dissolve fairly readily, and have the melting point 103 to 104 02 ). 



In continuation of their work 3 ) on the formation and distribution 

 of organic substances in the plant, E. Charabot and G. Laloue 4 ) 

 have now studied the production of essential oil in the orange tree 

 during its period of vegetation (as previously with the geranium plant 

 and the mandarin tree). They observed that the formation of the 

 oil proceeds most briskly at the beginning of the vegetation - period. 

 At this stage the oil in the young leaves is not so rich in esters and 

 total alcohols as that of the young twigs and stalks. Towards the 

 end of the development of the plant this difference in the ester- 

 content becomes even more pronounced. The oil of the old leaves 

 is then however much richer in total alcohols than that of the stalks, — 

 especially in linalool, less so in geraniol. Between these two stages 

 of development the leaf-oil experiences a very pronounced decrease in 

 its content of linalool, and against this a slight enrichment in esters. 

 The oil in the stalks on the other hand becomes in a marked degree 

 richer in esters, but strikingly poorer in total alcohols. It follows from 

 the foregoing that the oil in the stalks is less soluble than that in 

 the leaves. In consequence of this, the osmotic pressure in the stalks, 

 according to the law of diffusion, will constantly decrease, and there- 

 fore a transition of a portion of the oil will take place from the leaf 

 towards the stalk, with displacement of a portion of the less soluble 

 oil from the saturated solution in the stalk. A second work by the 

 above-named authors 5 ) deals with the distribution of the essential oil 

 in the orange blossom. According to this, of all blossom organs the 

 leaves of the blossom contain the largest quantity of oil. As a matter 

 of fact, the oil -content of the blossom decreases considerably during 

 the flowering -period. At this stage, the production of the odorous 

 substances is much more brisk than at any earlier period. In the 

 course of the development of the blossoms an enrichment of the oil 



1 ) Journ. f. prakt. Chem. II. 59 (1899), 352. 



2 ) According to our observations the melting point of this compound lies at 

 105 to 106° 



3 ) Report October 1903, 40; Report April 1904, 50. 



4 ) Compt. rend. 138 (1904), 1228. Bull. Soc. Chim. III. 31 (1904), 884. 



5 ) Compt. rend. 138 (1904), 15 13. Bull. Soc. Chim. III. 31 (1904), 937. 



