i; 175 ] lis 



In Tuscany, 150 cocoons, from large worms, in a favorable 3'ear, and 

 208 in a bad year, weigb a pound of 12 ounces. 



One hundred and ninety-five cocoons froni small worms, (peslal- 

 jjini) in a favorable year, and two hundred and seventy-one in a bad 

 year, weigh a pound.* 



In Pensylvania, 306 cocoons, from worms fed by the late Mr. 

 Busti,t and from 490 to 600 in the establishment of Messrs. Ter- 

 lioeven, weighed a pound. 



Eight hundred and eighty-two clean cocoons, from worms fed en- 

 tirely on the leaves of the native red mulberry tree, by Mr. Joshua 

 Pierce, of Washington City, weighed a pound, six months after they 

 were formed. 



An ounce of eggs will produce from 30 to 40 pounds of cocoons, 

 according to Mr. JDelalauzeJ in France. 



Mr. Stephenson says that, in Languedoc, one quintal of cocoons, 

 (104 Amer.) will yield from nine to ten pounds of spun silk; and that 

 "from five to ten pounds of silk is the produce of an ounce of eggs: five 

 pounds are deemed a fair return. 



Four cocoons from imported eggs, the worms fed by Mr. Dusar, of 

 Philadelphia, weighed each, with the flos, 24^, Sl^, 262, and 28.^ 

 grains, troy. 



Proportion of eggs to cocoons. 



In an establivshmcnt in France, where from 10 to 12 ounces of eggs 

 •were for 22 years regularly hatched, each ounce produced from 63 to 

 95 pounds of cocoons, once only 63. In another, in which six ounces 

 were annually hatched, during ten years, each ounce produced con- 

 stantly a quintal of cocoons.§ In Italy, according to Dandolo, the ave- 

 rage yield is only 45 lbs., but he adds that 120 lbs. should be the pro- 

 duce. In another part, Novara, of the same kingdom, 100 lbs., and 

 ;it Varese, from 50 to 60 lbs. v/erc obtained. || In Tuscany, every 

 })ound of eggs, (the pound reduced to nearly 12 oz. ) yielded 100 lbs., 

 in the establishment of Lambruschini.lT Dandolo says, that one pound 

 iind a half of male and female cocoons will yield two ounces of eggs. 

 Sauvage"* " estimates the proportion of cocoons from an ounce of eggs 

 ■producing 40,000 worms, to be from 50 to 100 lbs. of cocopns; the 

 chance of success being in an increase ratio to the proportion of eggs. 

 One hundred pounds of cocoons will be produced from one ounce, 

 while only 60 pounds will be the yield of one ounce, when ten ounces 

 are hatched together. This difference must certainly result from the 

 want of room for the worms proceeding from the larger quantity, and 



* Tram. GeorgopWle Soc. of Florence, vol. 4, p. 411. 

 t Memoirs Phila. Soc. for the Prom. Agric. vol. 5, p. 266. 

 4 Traite sur des Vers a Soie, p. 290. 



§ Nysten, Recherches sur la Maladies des Vers a Soie, p. Ill- 

 II Murray on the Silkworm, Edinb. 1826. 



^ Atli della Soc. &.c.— or Ti'an^. of the Georg-opWIe Soc. Florence, vol. 4, p. 411. 

 " First Memoir, p. 5?. 



