Benjamin Franklin : To Cadwallader Evans. London, 18 July, 1771
Method of cultivating silk in China.
Dear Doctor,
I wrote to you on the 4th instant, and sent you a paper of observations on your specimens of silk, drawn up by Mr. Patterson, who is noted here in that trade, with a specimen of Italian silk as a copy for our people to imitate. But they must not be discouraged if they should not come up to the lustre of it, that being the very finest, and from a particular district in Italy, none other being equal to it from any other district or any other country.
The European silk I understand is all yellow, and most of the India silk. What comes from China is white. In Ogilby's account of that country, I find that, in the province of Chekiang, "they prune their mulberry trees once a year, as we do our vines in Europe, and suffer them not to grow up to high trees, because through long experience they have learned, that the leaves of the smallest and youngest trees make the best silk, and know thereby how to distinguish the first spinning of the threads from the second, viz. the first is that which comes from the young leaves, that are gathered in March, with which they feed their silkworms ; and the second is of the old summer leaves. And it is only the change of food, as to the young and old leaves, which makes the difference in the silk. The prices of the first and second spinning differ among the Chineses. The best silk is that of March, the coarsest of June, yet both in one year ". I have copied this passage to show, that in Chekiang they keep the mulberry trees low ; but I suppose the reason to be, the greater facility of gathering the leaves. It appears too by this passage, that they raise two crops a year in that province, which may account for the great plenty of silk there. But perhaps this would not answer with us, since it is not practiced in Italy, though it might be tried. Chekiang is from twenty-seven to thirty-one degrees of north latitude. Duhalde has a good deal on the Chinese management of the silk business.
Literature : Occident : United States of America