120 NEW PUBLICATIONS. 
`E. officinarum, L., E. antiquorum, L., and E. tetragona, Haw., have each 
been accredited with its production; but Dr. Pereira, who examined the 
question with his usual critical ability, stated that only Æ. canariensis 
fulfilled all the requisite conditions of locality, etc.; and that he felt 
little hesitation in ascribing the gum to this plant. He says (Elements 
Mat. vol. ii. pt. 1. p. 399, 1855) that the specific characters “ apply 
to the branches found mixed with the Euphorbium of commerce. 
agree with the description and figure of Ti£Aymalus aizoides lactifluus, the 
Euphorbia canariensis of Plukenet." Miller also (Gard. Dict. vol. i. art. 
Euphorbium) states that in looking over some Euphorbium in a shop, 
he “ found several spines amongst it, which exactly agreed with those of 
that plant.” Pereira found in some specimens of the gum, spines resem- 
bling those of Æ. tetragona, Haw. 
- But better materials led Bere to trace its origin to a new species, to 
which he gave the name of Æ. resinifera, and described from dried remains 
picked out of the gum. Æ. resinifera has a stem 4 the size of that of Æ. 
canariensis, and stalked umbels, whilst E. canariensis has almost sessile 
flowers. Berg gives figures in ‘Berg und Schmidt, Darstellung und 
Beschreibung simmtlicher oin der Pharmacopeia Brussica.’ The gum 
eontains 20 per cent. of an acrid principle Euphorbin (Ca, Ha505); 50 
acrid indeed that in the collection of the gum the fingers become ex- 
coriated if brought into contact with it, and it is the practice to cover 
the mouth and nostrils to avoid the excessive sneezi g which would other- 
wise ensue. e best general account of the production of this gum 
is that by Jackson, in his * Account of Morocco.’ : 
Dr. Cosson has also compared the various materials he has with a 
b 
wie 
growing plant at Kew (which has not yet flowered), sent by Mr. F. Car- 
tensen, the English Consul at Mogadore. Tf the history of this plant can 
be satisfactorily attested as being the species actually producing the gum, 
its flower be looked to with some egree of interest, as the ques- 
chona question, He has described and figured in the * Bulletin de la 
native of Ocaña, in New Granada. ‘Ihe vernacular name appended to the 
specimens of this plant, which were collected by Purdie in October, 1845, 
is * Quina de la tierra fria.” C. rosulenta is very close, both in appearance 
and chemical composition, to C. succirubra, the bark, however, has a mt 
roseate hue, and the leaves approach C. ovata, the nerves, however, berg 
more rigid and prominent. Mr. Howard identifies this species with the 
Quinguina rosé d'Ocafia, of M. Delondre, a figure of which is given 1n 
that author's * Quinologie;' also with M. Rampon's quinquina à qum- 
dine, described in Dr. Planchon’s * Des Quinquinas ; aud also with Dr. 
ittstein's * Pseudo regia.’ 
“a This bark has long been known in French commerce under the name of 
“ Quina rosé,” and we are grateful to Mr. Howard for thus clearly settling 
its synonymy, and giving it a botanical position. j€ 
