WRIGHT: THE GENUS DIOSPYROS 
uncertainty has long been recognized by persons engaged in 
financial speculations, and too much stress cannot be laid on 
the individual variation which occurs in trees of the same 
species from the same or different localities. 
On the other hand, there can be no question as to the 
specific tendencies to produce a definite type of heartwood, 
ah^t f eV8n **" ° ne ^ 40 a ^ Iow a wi ^ e range of vari- 
abihty for each species. For instance, the heartwood of D. 
Melanoxylon and D. Ebennm is almost invariably jet black, 
rert o“f T T M ‘ ‘ heSe tW08 P eclM provide the greater 
ZlZ7ll2 m In ,f “ d Ceylon 5 D ’ 
always nrod ^ a black heartwood, D. Gardner! 
which k f !T 3 y W W °° d ’ and D - Moonii a timber 
strands. 8 ^ 
were the ,r° Bd e 110 poe8ible doubt of the species 
were the timbers of D. Ebennm, D. Kurzii, D. imdgnis, 
sismrr witti one ^ s 
“ Cters are so pronounced, 
explaiij*!^ tendencies are somewhat difficult to 
tion of the coloured s b 8 * >eCleS are: ^ the means of distribu- 
gum and resin^realnt in ftMil^es “ Pr ° POrti0n of coloured 
^ ** -—«_> 
Xylems elements of ****** * ^ 
with one another, and therefor J 7 Com monicating 
which contain a hi»h J th ° 8e 8 P ecies the timbers of 
woodparenchymasLuidThowZ 1 cells and 
of colouring substances J* ^ mo9t gene,al distribution 
insignia is highly parent J?! *** the X ? lem of 
to the conclusion that for fh* FeaUy white P ointe 
superabundance of colons ! Production of ebony the 
zsz&zrxssst 
the formation of central eh* fmd to prevent 
ony m timbers where the colonring 
