192 ECONOMIC BOTANY. 



i87i. MILK OR Cow TREE OF PARA. Specimens in flower and fruit 

 of this tree, which is called Massaranduba, are required for the 

 accurate determination of the species. 



CAOUTCHOUC, OR INDIA-RUBBER. All the Central American 

 caoutchouc is presumed to be obtained from Castilloa elastica, 

 the " Ulc-ule" tree. Are there any other species of this genus, 

 or trees likely to be mistaken for Castilloa elastica sources of 

 supply ? In New Granada there is said to be a pinnate-leaved 

 tree yielding caoutchouc what is it ? 



HEVEA (SIPHONIA) BRAZILIENSIS is the chief source of Para 

 india-rubber, but other species yield it, as If. lutea, R. discolor, 

 H. paucifolia and H. rigidifolia. It would be exceedingly 

 desirable to know the relative yield of these several trees, and 

 to obtain good specimens of them. 



In Pernambuco and Ceara there is much good india-rubber 

 said to be the produce of Hancornia speciosa, the " Mangaba " 

 of the Brazilians. Eeliable specimens and information are 

 desired. 



In British and French Guiana caoutchouc trees exist, good 

 specimens of which, with their several products, should be 

 collected. 



MALAMBO BARK. 



(Malambo-Rinde, von Croton Malambo.) 



1859. THE origin of this aromatic bark, which has been a disputed 



OrighTdeter- question ever since its introduction to Europe by Bonpland in 



mined by Mr. the year 1814, has at length been satisfactorily determined by 



Mr. H. Karsten, of Berlin. A residence of twelve years in the 



northern countries of South America has enabled Mr. Karsten 



to make many interesting and important observations on the 



vegetation of that botanically rich region, the results of which 



observations he is now communicating to the scientific world 



in a magnificently illustrated work, under the title of Florae, 



Columbia Terra rumque, adjacentium Specimina Selecta. 1 From 



1 Berlin, F. Dummler, folio. 



