The kingdom of . isvery rapid, while the weight of leaves consumed isabout one half. They are extremely healthy andthe amount of disease small. 268 Kingdom of Siam The average number of eggs deposited by a nativemoth is from 260 to 350. The cycle of the Siamese variety is as follows: Egg Stage 10 days Larva .0 25-32 Pupa 10-12 Moth (Image) 3-4 Total 48-58 days It is thus possible to rear these worms seven toeight times a year, provided a sufficient crop ofmulberry leaves can be obtained. According to the results obtained at the Govern-ment Experimental Station, it requires twelve tosixt
The kingdom of . isvery rapid, while the weight of leaves consumed isabout one half. They are extremely healthy andthe amount of disease small. 268 Kingdom of Siam The average number of eggs deposited by a nativemoth is from 260 to 350. The cycle of the Siamese variety is as follows: Egg Stage 10 days Larva .0 25-32 Pupa 10-12 Moth (Image) 3-4 Total 48-58 days It is thus possible to rear these worms seven toeight times a year, provided a sufficient crop ofmulberry leaves can be obtained. According to the results obtained at the Govern-ment Experimental Station, it requires twelve tosixteen kilos of leaves to produce one kilo of silk. The cocoons of the Siamese varieties are long,ellipsoidal, tapering and pointed at bothends, and surrounded by much floss. The length of silk per cocoon is from 200 to 250metres, and the yield of silk is as follows: 370 grams silken matter630 non-silken matter 1000 grams cocoons One kilo of fresh cocoons yielded 75 grams good raw silk40-45 inferior raw silk4-5 waste silk. z < The Industries of Siam 269 Under scientific methods the amount of good rawsilk has already been increased by thirty per cent. The two known kinds of native worms are (i)plain white; (2) vers tigr^s. The first (plain white) is the better variety andyields silk twenty-seven to forty-five per cent,longer per cocoon than the latter variety. The size of the have is smaller than that of foreignvarieties and yields a fine raw silk, which The Bave. has a higher market value than larger-sized raw silk. In Siam it is found that one rai of land {1600square metres) will yield about 2000 kilos of mul-berry leaves, and 14 kilos of leaves pro- •^ ^ ^ Rearing. duce one kilo of cocoons, yielding 75 to78 grams of good raw silk, hence one rai of landwill give between 10 and 11 kilos of raw silk perannum, valued at 200 to 300 ticals. The cost of reeling the silk on a large scale isabout nine ticals per kilo. It is the intention of the Government to fosterthe silk industry
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