I have often from my boat, during dark nights on the Langat river, listened to the weird note which my Malays invariably ascribed to these insects, and which is not inaptly represented by one of the Malay names for them, viz. "belum-belam." I have not yet, however, succeeded in identifying the real producer of the note, of which all I can say at present is, that although it may not be itself discoverable, the Malays look upon it as a certain guide to the localities where the Malacca-canes grow. The Tualang or Sialang Tree So too of the Tualang-tree Mr. Wray writes:-- "One of the largest and stateliest of the forest trees in Perak is that known as Toallong, or Toh Allong; [361] it has a very poisonous sap, which produces great irritation when it comes in contact with the skin. Two Chinamen who had felled one of these trees in ignorance, had their faces so swelled and inflamed that they could not see out of their eyes, and had to be led about for some days before they recovered from the effects of the poison. Their arms, breasts, and faces were affected, and they presented the appearance of having a very bad attack of erysipelas. These trees are supposed to be the abiding-places of hantu, or spirits, when they have large hollow projections from the trunk, called rumah hantu, or spirit houses. These projections are formed when a branch gets broken off near the trunk, and are quite characteristic of the tree. There are sometimes three or four of them on a large tree, and the Malays have a great objection to cutting down any that are so disfigured, the belief being that if a man fells one he will die within the year. As a rule these trees are left standing when clearings are made, and they are a source of trouble and expense to planters and others, who object to their being left uncut.