78 THE USES OF PLANTS. 



tinople, and (2) that of Egypt, the produce of the 

 round-capsuled P. somniferum, var. glabrum, Boissier, 

 and that of (3) Persia, (4) India, (5) China, and (6) 

 Europe, the produce of the ovate-capsuled var. 

 album, Boissier. We import the drug mainly from 

 Turkey. The capsules are used whole for fomenta- 

 tions, and the seed (known as ' Maw-seed ') for oil. 

 The residue, after the extraction of the oil, is an oil- 

 cake, valuable for cattle. The petals of our common 

 wild poppy (Papaver Rhceas, L.) are used in pharmacy 

 merely as a red colouring agent. 



Chelidonium majus, L., the GREATER CELANDINE, a 

 rustic remedy for warts, gives its name to, but does not 

 enter into the composition of, a patent cure for corns. 



CRUCIFER^E. 



Brassica nigra, Koch, MUSTARD, which has already 

 been mentioned as a condiment (p. 63, supra), is a 

 powerful external stimulant. It contains an albu- 

 minous substance, discovered in 1839, known as 

 ' myrosin/ and an essential oil, Allyl sulphocyanide, 

 C 4 H 5 NS, which also occurs in Reseda lutea, L., and 

 R. Luteola, L. Myrosin occurs in Brassica alba, 

 Hook. fil. and Thorn., together with Sinalbin, 

 C 30 H 44 N 2 S 2 16 * 



CANELLACE^:. 



Canella alba, Murray, a West Indian tree, yields 

 an aromatic bark known in the Bahamas, whence it 

 is imported, as * WHITE WOOD BARK ' or ' CINNAMON 



BARK.'f 



* Bentley and Trimen, pi. 22, 23. 

 f Ibid., pi. 26. 



