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The lake, besides yielding fish to the nets of Ossaroo, also afforded a supply of vegetables. On searching it, the botanist discovered several edible kinds of plants; among others the curious Trapa bicornis, or horned water-nut known among the natives of the Himalayan countries by the name Singara, and much used by them as an article of wholesome food.
This was so esteemed by Sebituane that he made it part of his tribute from the subjected tribes. Dr. Hooker kindly informs me that the njefu "is probably a species of 'Trapa', the nuts of which are eaten in the south of Europe and in India. Government derives a large revenue from them in Kashmir, amounting to 12,000 Pounds per annum for 128,000 ass-loads!
The minute divisions of the leaves of subaquatic plants, as mentioned in the note on Trapa, and of the gills of fish, seem to serve another purpose besides that of increasing their surface, which has not, I believe, been attended to, and that is to facilitate the separation of the air, which is mechanically mixed or chemically dissolved in water by their points or edges; this appears on immersing a dry hairy leaf in water fresh from a pump; innumerable globules like quicksilver appear on almost every point; for the extremities of these points attract the particles of water less forcibly than those particles attract each other; hence the contained air, whose elasticity was but just balanced by the attractive power of the surrounding particles of water to each other, finds at the point of each fibre a place where the resistance to its expansion is less; and in consequence it there expands, and becomes a bubble of air.
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