P — 83 — 



cc. decinormal silver solution, then (10 — N) -0,198 == the quantity of allyl- 

 isosulphocyanate yielded by 100 grams mustard flour. 



By this method, English mustard seed was found to contain 1,386 p. c. ; 

 Greek 1,198 p. c; mustard seed from Merville 1,08 p. c; Sicilian 0,99 p. c; 

 Bari mustard seed 0,99 p. c. and Bombay mustard seed 0,81 p. c. allyl- 

 isosulphocyanate. 



H. Penau 1 ) has likewise been engaged in the determination of allyl- 

 isosulphocyanate in preparations of mustard. He rejects the usual methods 

 of weighing the sulphide of silver which has been separated out, or of 

 titrating the excess of silver solution with ammonium sulphocyanide 

 according to Volhard. In lieu thereof he proposes either to weigh in the 

 form of chloride of silver the silver which has not entered into reaction, 

 or to titrate it with decinormal silver solution after adding an excess of 

 cyanide of potash. 



From a paper by C. Grimme 2 ) on the fatty oils of the Crucifera? we 

 take the subjoined table showing the volatile oil-content of the various 

 mustard-seeds. The estimation was carried out according to the pre- 

 scription of the German Pharmacopoeia V. for the estimation of the mustard 

 oil content of black mustard seed. 



No. 



Name 



P. c. of Mustard Oil 

 in the 

 Press Residue Seed 



• 



10 



11 



12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 



Brassica oleracea acephala vulgaris . . . 



„ „ „ quercifolia . . 



„ „ „ crispa . . . . 



„ „ gemmifera 



„ „ sabanda 



„ „ capitala alba 



» » rubra 



„ „ gongylides 



„ „ botrytis • 



„ * „ asparagoides 



„ Rapa oleifera annua 



„ „ „ hiemalis 



„ „ rapifera 



„ „ teltoviensis 



„ Napus oleifera annua 



„ „ „ hiemalis 



„ „ „ flora alba . . . . 



„ „ rapifera ("Erdkohlrabi") . 



„ ("Wruke") 



Raphanus sativus albus 



niger 



„ „ Radiola ........ 



„ „ oleiferus 



0,119 

 0,079 

 0,159 

 0,198 

 0,178 

 0,357 

 0,357 

 0,198 

 0,159 

 0,178 

 0,119 

 0,159 

 0,252 

 0,198 

 0,156 

 0,119 

 0,099 

 0,099 

 0,020 

 0,263 

 0,179 

 0,159 

 0,199 



i) Journ. de Pharm. et Chim. VII. 6 (1912), 160. 



2 ) Pharm. Zentralh. 53 (1912), 733. Pharm. Ztg. 57 (1912), 520 



0,079 



0,051 

 0,103 

 0,144 

 0,129 

 0,258 

 0,259 

 0,142 

 0,104 

 0,119 

 0,085 

 0,093 

 0,166 

 0,132 

 0,097 

 0,071 

 0,056 

 0,062 

 0,012 

 0,164 

 0,108 

 0,106 

 0,133 



6* 



