37 



claim less than one-fifth for it in the hedge, we 

 think we must be thought moderate. 



The acre as we have before shown, in the 

 hedge-form, will contain 4840 trees, which when 

 4 years old, at 4 Ibs. of leaves to each, will pro- 

 duce 19,360 Ibs. of leaves, and feed 387,200 

 worms, as 50 pounds will support 1,000 during the 

 feeding season. 



4,840 

 4 



19,360 



1000 



5,0) 1936000,0 



387,200 worms. 



At 6 years old, according to our assumption, the 

 following will be the result : 



4,840 trees on an acre of hedge, 

 7 Ibs. of foliage per each, 



33,880 Ibs. of foliage upon an acre, 

 1000 



5,0) 33,88000,0 



677,600 



540,000 number of assumed by us. 



137,600 excess over our calculation. 



It would thus appear evident, that if the trees 

 at 8 years old should yield the quantity of leaves 

 assumed by us, an acre of land will afford fo- 

 liage enough to support 137,600, or one-fourth 

 more worms than we have claimed for it, which 

 would, as 3,000 give a pound of silk, make a 

 difference in favor of an acre in silk culture, over 

 our preceding estimate, of upwards of 45 Ibs. of 

 silk, or, at the rate of $4 per lb., of $180. 



It may be said, that all calculations which fix 

 the number of pounds of foliage to be produced 

 by a Mulberry tree, must necessarily be uncer- 

 tain, and equally so is the assumption that a tree 

 will yield food for any given number of worms. 

 But then in both of these forms we must be gov- 

 erned by the experience of such culturists as re- 

 liance may be placed upon. Count De Hazzi, 

 says, that " it is now exactly known, from long 

 experience, what quantity of food the worms re- 

 quire in their several ages, until they have begun 

 to spin their silk. Twenty thousand worms cor- 

 respond to one ounce of eggs of our weight, and 

 they require through all their ages a thousand 

 pounds of leaves." From 18 to 20 good Mul- 

 berry trees give, each, one quintal and a half of 

 leaves, and consequently, from 8 to 10 trees are 

 necessary for twenty thousand worms. From 

 the concurrent testimony of almost all the wri- 

 .ters, from 37 to 50 Ibs. of leaves is consumed 



during the feeding season by a thousand worms, 

 and having taken the largest average, we feel 

 certain that we cannot at all events be consider- 

 ed as exaggerating profits. 



TABLE OF DISTANCES. 



A table showing the number of plants on an 



acre at certain distances, there being 43,560 

 square feet in an acre. 



Feet feet plants. 



l\ by 6 4,840 



l\ by 8 3,630 



2 by 6 3,630 



3 by 6 2,420 



3 by 8 1,815 



4 by 4 2,722 

 6 by 6 1,210 

 6 by 8 907 

 8 by 8 686 



10 by 10 435 



10 by 12 . 363 



12 by 12 302 



12 by 15 242 



15 by 15 193 



15 by 20 145 



20 by 20 108 



20 by 25 8T 



24 by 24 75 



25 by 25 69 

 25 by 30 58 

 30 by SO 40 

 30 by 40 86 



TABLE OF MEASURES. 



14 oz. cocoons produce about 1 oz. eggs. 

 68 eggs weigh 1 grain. 



1 oz. contains 22,640 eggs.* 



5 ounces, 1 13,200 u 



10 ounces, 226,400 " 



15 ounces, 339,600 " 

 20 ounces, 452,800 " 

 40 ounces, 905,600 " 

 SO ounces, 1,811,200 " 



1,000 worms consume 50 Ibs. of leaves,f 

 9 Ibs. of cocoons will make about 1 lb. of silk, 

 3000 cocoons make about 1 lb. of silk.J 

 800 cocoons make about 1 lb. of cocoons. 

 A female moth will lay about 450 eggs. 



MODE OF GATHERING LEAVES. 



Count Dandolo states that much depends, in 

 regard to a long preservation of Mulberry trees 

 and hedges, on the method of gathering their 

 leaves; that it should be done with the greatest 

 care, to prevent the- trees from receiving injuries. 

 That caution is so much the more necessary, as 

 nature has not intended they should be stripped 



*The general computation is that an ounce of 

 eggs will hatch 20,000 worms. 



|Count Dandolo says 87 Ibs. will answer. 



JThe Precise number depends upon the 

 quality of the cocoons 24,000, 2,500, 2,542 

 and 3,000, have respectively made a lb. of silk. 



