THE JOURNAL 
OF 
THE LINNEAN SOCIETY. 
An Enumeration of the Dipterocarpacea, based chiefly upon the 
Specimens preserved at the Royal Herbayium and Museum, 
Kew, and the British Museum ; with arks on the Genera 
and Species. By Sir Dietrich Branpis, K.C.LE., F.R.S., 
F.L.S. 
[Read 6th December, 1894.] 
(Pra Tgs L-1II) 
In the well-known work ‘ Verhandelingen over de Natuurlijke 
Geschiedenis, the Botanical part of which was published at 
Leiden, 1839-42, Korthals gave the number of Dipterocarps 
known at that time as 34, viz. 23 species previously known, 
and 11 new species described by him in that work. 28 years 
later, in the 16th volume of the ‘ Prodromus’ (1868), A. 
DeCandolle enumerated 126 species ; Thiselton Dyer, in Hooker’s 
‘Flora of British India’ (1874), estimated the order at 170; and 
now, 20 years afterwards, there are 325 species, most of which 
I consider well established. These figures show the rapid in- 
crease which during the last 54 years has taken place in our 
knowledge of this difficult and interesting order. Dipterocarps 
as a rule are tall trees, and it is not easy to obtain complete 
specimens. Considering our, as yet, imperfect knowledge of the 
vegetation on the Philippine Islands, on large portions of Borneo, 
of Siam, and New Guinea, it seems not unreasonable to suppose 
that one half, or at the outside two-thirds, only of the existing 
LINN. JOURN.—BOTANY, VOL. XXXI. B 
