— 82 — { 



free terpineol. As much as 67 p. c. of the oil passed over between 260 and 

 270°. The principal constituent appears to be a sesquiterpene. The 

 product which boils between 260 and 270° and possessed the following 

 constants: di 5 o 0,9364, « D + 8,5°, n D2 io 1,5004. It gives characteristic colour- 

 reactions with glacial acetic acid and sulphuric acid (red coloration), with 

 acetanhydride and sulphuric acid (green coloration) and with bromine 

 vapour (blue coloration). When left to stand the last-named colour changes 

 by way of violet into green. It would appear that this sesquiterpene 

 occurs in the high-boiling fractions of many melaleuca oils. 



Milfoil Oil is again available in sufficient quantities, but we have 

 been obliged to raise the prices very materially. The collectors of the 

 raw material, both here and in the neighbourhood of our Bodenbach 

 works, demanded much higher rates than formerly, and in the end we were 

 forced to concede their demands as otherwise we could not have made 

 any oil at all. 



Monarda Oils. An investigation by Nellie Wakeman on the different 

 Monarda-speciGS is referred to on p. 142. 



Mustard Oil. The demand for our distillate of oil from mustard seed 

 has not been particularly animated, for as we have already pointed out 

 on previous occasions, the use of oil from seed has fallen off materially, 

 synthetic mustard oil having to a large extent replaced the natural article. 



It is well-known that we are manufacturers of the synthetic oil on 

 the very largest scale, and the only reason why we have occasionally 

 refused to follow the low prices of competitors is that we have no 

 difficulty in finding a market for our output at full rates. 



The results of the investigations into the determination of mustard oil 

 in mustard seed which have been carried out by D. Raquet 1 ) go to establish 

 the advantage of alcoholic over aqueous maceration. In a flask of 250 cc. 

 capacity, Raquet places 5 grams powdered mustard-meal with 100 cc. water 

 and 20 cc. 90 p. c. alcohol. The flask is then closed and heated during 

 one hour to from 30 to 35°, or it is left to stand for 6 hours with frequent 

 shaking. Distilling is then proceeded with from a glycerol-bath, the 

 distillate being caught in a flask of 100 cc capacity, containing 10 cc. 

 ammonia (di 5 o 0,925). After about 50 cc. has distilled over, the distillate 

 is diluted with 20 cc. decinormal silver solution and the distilling-process 

 is continued, after shaking, until a volume of 100 cc. has been obtained. 

 The mixture is now heated for one hour to 80 to 85° with reflux, filled 

 up after cooling, and filtered through chlorine-free paper. 50 cc. of the 

 distillate is titrated as usual with decinormal ammonium sulphocyanide 

 solution. If N = the number of cc. used up, and 10 — N = the number of 



!) Ann. Chim. analyt. appl. 17 (1912), 174. Quoted from Chem. Zentralbl. 1912, II. 457. 



