Mr. Murray on the Managemnt of the Silk Worm. 65 



The following is the Daily Decrease in Weight of 1000 

 ounces of Coccoons in a Room, the Temperature of which 

 is from 70° 25 F. to 72° 50 F. 



Day 1st, 1000 oz. 



2d, 991 less 9. 

 3d, 982 less 9, 

 4th, 975 less 7. 

 5th, 970 less 5. 

 6th, 966 less 4. 



Day 7th, 960 less 6. 



8th, 952 less 8. 



9th, 943 less 9. 



10th, 934 less 9. 



11th, 925 less 9. 



So that the 1005 ounces have lost in 10 days during the 

 mutation 75 ounces. There is a gradual declension for the 

 first five days inclusive, and a regular gradation for the five 

 last days. 



8 oz. of ova have lost in 5 days it) weight 100 gr. in 8 days 360, and in 10 dayi 440. 

 6 oz. do. do. do. 86 gr. do. 178 do. 248. 



5oz. do. do. do. 60 gr. do. 168 do. 216. 



4oz. do. do. do. 80 gr. do. 181 do. 224. 



Each grain contains about 68 ova, and an ounce weight 

 39,168 ova. The oncia Milanese contains 575 grains. The 

 above number is to be understood of fecundated ova. Those 

 which are badly impregnated contain 43,080, and are of a 

 reddish colour ; and of those not at all impregnated, and of 

 a yellowish tinge, there are in the ounce 44,100. 



The Expense of the Contingencies of the 5 ounces of Crop 

 in 1814 are thus calculated by Count Dandolo. 



Cost of 5 ounces of ova, 



Wood for fuel, 



5500 lbs. of leaves of mulberry al 



Expense of gathering the leaves, 



1000 lbs. at 32 soldi, 



Supplement, 



Supplemental paper, 



Oil for light, 



Preservation phial, 



Daily labour, 



Interest, &c. on capital, . • 90. 



Total expense, 732. 



401 lbs. of coccoons obtained, which, being sold at 



78 soldi per lb. produced . . 1,563.18 



Nett profit Lire 831.18 



VOL. II. NO. I. JAN. 1825. F 



