On this letter Mr. Thiselton Dyer makes the following remarks:—“Dr. Hickson’s account of the calcareous concretions occasionally found in the central hollow (filled with fluid—the so-called ‘milk’) of the endosperm of the seed of the cocoa-nut is extremely interesting. It appears to me a phenomenon of the same order as tabasheer, to which I recently drew attention in Nature.
“The circumstances of the occurrence of these stones or ‘pearls’ are in many respects parallel to those which attend the formation of tabasheer. In both cases mineral matter in palpable masses is withdrawn from solution in considerable volumes of fluid contained in tolerably large cavities in living plants; and in both instances they are monocotyledons.
“In the case of the cocoa-nut pearls the material is calcium carbonate, and this is well known to concrete in a peculiar manner from solutions in which organic matter is also present.
“In my note on tabasheer I referred to the reported occurrence of mineral concretions in the wood of various tropical dicotyledonous trees. Tabasheer is too well known to be pooh-poohed; but some of my scientific friends express a polite incredulity as to the other cases. I learn, however, from Prof. Judd, F.R.S., that he has obtained a specimen of apatite found in cutting up a mass of teak-wood. The occurrence of this mineral under these circumstances has long been recorded; but I have never had the good fortune to see a specimen.”[138]
The Durian
The Durian tree (for an account of whose famous fruit the classical description in Wallace’s Malay Archipelago may be referred to) is a semi-wild fruit-tree, whose stem frequently rises to the height of some eighty or ninety feet before the branches are met with. It is generally planted in groves, which are often to be found in the jungle when all other traces of former human habitation have completely disappeared, though even then its fruit, if tradition says true, is as keenly fought over by the denizens of the forest (monkeys, bears, and tigers) as ever it was by their temporary dispossessors. Interspersed among the Durian trees will be found numerous varieties of orchard trees of a less imperial height, amongst which may be named the Rambutan,[139] Rambei,[140] Lansat,[141] Duku,[142] Mangostin,[143] and many others. A small grove of these trees, which was claimed by the late Sultan ʿAbdul Samad of Selangor, grew within about a mile of my bungalow at Jugra, and I was informed that in years gone by a curious ceremony (called Mĕnyemah durian) was practised in order to make the trees more productive. On a specially selected day, it was said, the village would assemble at this grove, and (no doubt with the usual accompaniment of the burning of incense and scattering of rice) the most barren of the Durian trees would be singled out from the rest. One of the local Pawangs would then take a hatchet (bĕliong) and deliver several shrewd blows upon the trunk of the tree, saying:—
“Will you now bear fruit or not?
If you do not I shall fell you.”[144]
To this the tree (through the mouth of a man who had been stationed for the purpose in a Mangostin tree hard by) was supposed to make answer:—
“Yes, I will now bear fruit;