“But where can they obtain this jelly-like substance?” asked Emily.
“I believe it is produced from a mollusc of some sort, on which the birds feed. When they require to build their nests, they disgorge the gelatinous portion for the purpose; and as this substance possesses the nutritive qualities of animal matter, I have little doubt that it is produced from these molluscs,” said Mr Hooker.
Not only within the cavern, but on all available and tolerably sheltered spots outside, we saw a number of the sea-swallows’ nests. We pulled close under one cliff, where we could distinguish clearly a bird sitting in its nest—we concluded on its eggs—and looking very much at its ease. Another little bird was standing watching its nest. We supposed therefore that its young had been hatched; and as they were in an inaccessible part of the cliff, we hoped they would escape the Chinaman’s grasp.
As we had given a good price for the first nests, the Chinese willingly sold us another dozen, with which, wishing them a successful bird’s-nesting expedition, we returned on board the Dugong. The Malays assert that the bird feeds upon insects and other minute creatures floating on the surface of the sea; and on further examining the nests, we perceived long filaments resembling very fine vermicelli, coiled one part over the other, without any regularity, and glued together by transverse rows of the same material. Mr Hooker told us that the trade in birds’ nests employs a large amount of capital and men. However, the loss of life arising from accidents and exposure is very great. It has been asserted that, on an average, two out of every five men employed in bird’s-nesting meet with a violent death. In China a “catty” or one pound and a quarter English, of the best nests, sells at about 9 pounds sterling. Their value depends chiefly upon their translucent whiteness. Those which have not been lined or used by the birds obtain the highest prices.
Frau Ursula made a small dish of a few of the birds’ nests, which, when first put before us, were perfectly tasteless. When, however, she had added certain seasoning, it was pronounced as delicate as any food could be. The Chinese use them chiefly for thickening their soups and ragouts.
The sea-swallow is found along the northern coast of Australia, as well as on the rocks and islands of the sea which we were now navigating. A large number of Chinese junks come every year to procure the nests, which are greatly prized in China.
As we neared the Aru Islands we passed close to a number of boats at anchor, the people from which were continually jumping overboard, diving, and returning to the surface with some creatures in their hands. As on the previous day, the wind was light, and we were able to accompany Mr Hooker, and pulled off in the boat to see what they were about.
“What can they be getting?” I asked.
“The creatures the natives are collecting are the holothurians, or sea-cucumbers,” answered the naturalist. “There are a great many species of these creatures; but, I believe, those found on banks of coral sand are the most valued.”
Emily and Grace, however, when they saw the creatures, could not help expressing exclamations of disgust at their appearance. They were like gigantic slugs, or long black bags with frills at the top. Mr Hooker purchased a basket full of the creatures, which he wished to examine more at his leisure.