EUCALYPTUS TREES. 253 
the Mediterranean Sea. It yields the Alkanna root, 
used for dyeing oleaginous and other substances. It 
might be naturalized. 
Allium Schcenoprasum, L.—The Chives. Europe, 
Northern Asia, and North America. Available for 
salads and condiments. This species of allium seems 
not yet so generally adopted in our culinary cultiva- 
tion as Allium Ascalonicum (the eschalot), A. Cepa 
(the ordinary onion), A. fistulosum (the Welsh onion), 
A. Porrum (the leek), or A. sativum (the garlic). 
A. Scorodoprasum, or the Sand Leek of Europe and 
North Africa, resembles both garlic and eschalot. 
Aloe ferox, Mill. —South Africa. This species yields 
the best Cape Aloe, as observed by Dr. Pappe. The 
simply inspissated juice of the leaves of the various 
species of this genus constitutes the aloe drug. It is 
best, obtained by using neither heat nor pressure for 
extracting the sap. By re-dissolving the aqueous 
part in cold water, and reducing the liquid, through 
boiling, to dryness, the extract of aloes is prepared. 
All species are highly valuable in our colony, where 
they are hardy, and can be used, irrespective of their 
medicinal importance, to beautify any rocky or other- 
wise arid spot. 
Aloe linguiformis, Miller—South Africa. Accord- 
ing to Thunberg, from this species the purest gum- 
resin is obtained. 
Aloe plicatilis, Mill.—South Africa. The drug of 
this species acts milder than that of A. ferox. 
Aloe purpurascens, Haworth, —S. Africa. Again 
one of the plants which furnishes the Cape Aloe of 
commerce, 
Aloe socotrina, L.—Hills of the Island of Socotra, 
