— 8o — 



Labiatse) which grows in South-Dakota. The oil-yield, calculated for 

 green herb, was 0,8 °/ . The oil was pale yellow, of an odour resembl- 

 ing that of peppermint, but also pointing to the presence ofpulegone; 

 the taste was strongly peppermint -like and acrid. The oil dissolved 

 without turbidity in half its vol. of 90 per cent, alcohol, and possessed 

 the following constants: d 0,9267, « D -[- 16 27', acid no. 2,6 ester 13,1, 

 corresponding to a content of 4,6 °/ of ester C 10 H 19 O CO CH 3 , ester 

 no. after acetylisation 47, corresponding to i3,57°/ of alcohol C 10 H ly OH. 

 No aldehydes could be detected either with fuchsine or with Nessler's 

 solution. 



Oil of Monarda didyma L. Some time ago 1 ) we reported 

 on 2 oils of Monarda didyma L. (N. O. Labiatse) distilled by ourselves, 

 the one from flowers, the other from herb. Last summer we were again 

 in a position to prepare an oil of this kind from half -faded flowers, 

 and found it to possess constants similar to those observed in that 

 distilled a year earlier: di 5 o 0,8740, «b — I5°45 / , n D20° M6743, 

 acid no. 4,6, ester no. 5,6, soluble in 3 vols, and over of 70 per cent, 

 alcohol; after the addittion of 6 vols* of alcohol paraffin began to 

 separate out in abundance. The colour of the oil was lemon-yellow, 

 the odour peculiar, resembling ambergris, and rather faint. The yield 

 of oil equalled 0,26 °/ . 



Oil of Morinda citrifolia. In the fruit of Morinda citrifolia L., 

 N. O. Rubiaceae, a native of the tropics, C.J. E. Lohmann 2 ) some years 

 ago discovered the presence of one of the higher alipathic acids in 

 conjunction with an ester. This fruit (known locally as Bengkudu or 

 Tjangkudii), yields an essential oil which was prepared some time ago 

 in Java by A. W. K. de Jong, and which has recently been examined 

 by P. van Romburgh 3 ). 



The oil was of a yellowish colour, and had a sp. gr. of 0,927 

 at 1 3 . It was cloudy, owing to the separation from it of small 

 crystals, which, recrystallised from alcohol, melted at 6o°, and, upon 

 analysis, were shown to consist of paraffins. When freed from the 

 crystals the oil was almost entirely soluble in dilute soda -liquor. In 

 the solution capronic (m. p. — 5,2°; d^o 0,932) and caprylic acid 

 (m. p. 15,2°; d^o 0,913) as well a traces of the higher aliphatic 

 acids, could be detected. 



In the neutral part of the oil, which only amounted to a few 

 per cent, ethyl alcohol (identified by the b. p. and the iodoform-test); 

 also probably methyl alcohol and alcohols of a fusel-like odour, could 

 be detected after saponification. 



J ) Report November 1908, 86. 



2 ) Report Gov. Botanical Gardens, Buitenzorg 1896, 59. 



3 ) Koninklijke Akademie van Wetenschappen te Amsterdam, 1909, 17. From 

 a copy kindly sent to us. 



