117 [ 175 ] 



5 lbs. from well managed worms, gave one pound and a quarter of 

 silk* in France. Twelve pounds produced the same quantity of silk, 

 in another house. 



5 lbs. gave one pound at Varcse, in Italy. t 



10 killogrammes, (22 \hs. Amer.) gave one killogrammc of silk — 

 (2 lbs. 3 ozs. 5d. avoirdupois.) 



12 killogrammes (26^ lbs. Amer.) of cocoons of a good quality, give 

 one K. of organzine, of four or five cocoons. Inferior cocoons will re- 

 quire 14 K. to produce the same weight. 



For a K. of fine silk, of nine or ten cocoons, 11 K. of fine cocoons, 

 and 13 K. of the second quality will be required. 



To make a K. of tram silk, 9 to 11 K. (244 lbs, Amer.) of cocoons, 

 are required, according to their quality. J 



Mr. Chcisel, in the Isle of France, obtained ISO ounces, (French) 

 from 55,000 cocoons. 



The estimates of the number of worms to make a pound of silk, are 

 as various as the proportions of cocoons to the same quantity of silk. 

 The difference in both cases may proceed from the different sizes of 

 the worms, and the greater or less care in feeding them. Mr. Storrs, 

 of Connecticut, says that 4,000, and Mr. Tufts, of Massachusetts, that 

 3,000, are required to make a pound. Mr. Falley, of Ohio, estimates 

 ihat 5,000 are requisite. 



JVeights of cocoons. — Produce of cocoons, mid of silJc from an 



ounce of eggs. 



Mr. Stephenson says, that 220 cocoons, tolerablv good, weigh a 

 pound French. Three thousand cocoons of the worm of three casts, 

 weigh Ih pounds French, according to Dandoio. 



In France, from 45 to 50 killogrammes of cocoons, (.90 to 100 lbs.) 

 are expected from one ounce of eggs, carefully hatched and worms well 

 fed and attended. An ounce of eggs consists of about 40,000, half oi 

 which commonly are lost from sickness in the worms. § 



Two liundred cocoons from worms reared in the earh- settlement of 

 Georgia, weighed one pound. || 



At Washita, 240 cocoons, from worms reared by Judge Brj'^, weighed 

 one pound. IT 



Three thousand three hundred cocoons weighed twelve pounds.** 



In one establishment in France, 262 cocoons, in another 267, in a 

 third 271, and in a fourth 328 cocoons, weighed a pound of twelve 

 ounces. 



These different results proceeded from diversities in the treatment, tt 



* Stephenson, Trans. Soc. Arts, I.ondon, vol. 43. 

 f J. Mvirray, Treatise on Silkwomis, Edinb. 1826. 

 t Reynaud, p. 140. 

 ^ Reynaud p. 358. 



11 MS. Journal of the Rev. Mr.'Boltzius of Ebcnezer, vol- .", p. 855. 

 1 Letter in answer to the silk circular. 



** Pullein, p. 181. 

 ft Nysten, page 71- 



