KIDD'S OWN JOURNAL. 
upou the self-same hundred worms through- 
out. Should any of your readers have some 
eggs of the silkworm which produces the 
white silk, or the pale straw, and also be 
willing to send me a few hundred eggs, I will 
(D.V.) make a similar synopsis, and send it 
to Our JOURNAL; giving you as many 
orange-colored as you can wish in exchange. 
I will here simply remark that I weighed 
a skein of silk, produced from 100 pale straw- 
colored worms, reared in the year 1841, and 
it gave 81 grains. Also a skein of white 
silk reared in 1840, and it gave 72 grains. 
The average weight of these white cocoons 
with the silk taken off preparatory to winding 
(1840), is 6 grains and 9-10ths. And the 
average weight of the cocoon of pale straw- 
colored silk, before the silk is taken off pre- 
paratory to winding, is 6 grains and 6-10ths. 
The few following remarks appear to me 
curious and striking. They are taken from 
the Table I now send you. 
100 cocoons, after the loose silk was taken 
off preparatory to winding, weighed 1587 
grains and 8-10ths. 
Now, Mr. Editor, it would appear that the 
weight of 100 full chrysalides (1437 grains), 
and the weight of the skein of silk produced 
(109 grains and 8-10ths), should give the 
same result. But they do not They give 
only 1546 grains and 8-10ths; or a loss of 
41 grains. This may, however, be accounted 
for by a certain loss of silk consequent upon 
the operation of winding, as well as the 
rejection of the slight filmy envelope which 
surrounds the chrysalis. 
Again, it would appear that the weight of 
100 empty chrysalides (20 grains and 9-10ths) 
and that of 100 moths (871 grains and 4-10ths), 
ought to give the same result as that of 100 
full chrysalides. But it is far otherwise; 
and here we havea remarkably striking fact. 
There is a loss of no less than 544 grains and 
7-10ths. This is occasioned, no doubt, by 
the transformation of the soft substance, 
which at first filled the chrysalis, into the 
beautiful feathery moth, which, after a while, 
breaks forth.* 
Now for the grand climax. We find that, 
from 190 eggs, weighing only 1 grain and 
3-10ths, are produced 100 silkworms, mea- 
suring in length 25 feet, and weighing 8 
ounces and 11-48ths. These produce a skein 
of silk of 13 miles and 4-5ths in length, and 
weighing 109 grains and 8-10ths; leaving, 

* It may here be imagined, that I ought to 
have taken into consideration the weight of the 
fluid ejected by the moths, and so make the pro- 
per allowance. But, be it observed, it is not 
every moth that does eject the fluid,—say one- 
third ; so, if we reckon 20 grains on this account, 
it will still leave a deficiency of 524 grains and 
7-10ths.—B. A. 
101 

after the silk is wound off, 100 chrysalides 
weighing 1437 grains. These, inashort time 
after, produce 100 moths, which weigh 871 
grains, and 4-10ths, leaving behind them 
their empty chrysalides which only weigh 20 
grains and 9-10ths. 
Truly marvellous and astounding are all 
the works of the omnipotent God! 
Bompyx ATLAS. 
Tottenham, Aug. 20. 
TABLE OF OPERATIONS AND EXPERIMENTS. 

PRACTICAL OBSERVATIONS ON ‘‘ BOMBYX MORI.”’- 
Fed from the Egg on the leaves of the Black 
Mulberry. Hatched 20th May, 1853. 
100 Silkworms produced 73,370 feet of silk, or 
about 13 miles and 4-5ths. 
Average length of silk produced per silkworm, 
733 feet and 7-10ths. 
Average length of full-grown silkworm, on easy 
stretch, 2 inches and 3-4ths. 
Average length of full-grown silkworm, on full 
stretch, 3 inches. 
Average girth of full-grown silkworm, 1 inch and 
1-4th. 
Length of 100 silkworms on easy stretch, 22 feet 
{1 inches. 
Length of 100 silkworms on full stretch, 25 feet. 
Girth of 100 silkworms, 10 feet 5 inches. 
Weight of skein of silk, produced from i00 silk- 
worms, 109 grains and 8-10ths. 
Average weight of silk produced by each silk- 
worm, 1 grain and 98-1000ths. 
Average weight of full-grown silkworm, 39 grains 
and 5-10ths. 
Weight of 100 silkworms, 8 ounces and 11-48ths. 
Weight of 100 cocoons, before the loose silk was 
taken off preparatory to winding, 1628 grains 
and 9-10ths. 
Average weight of cocoon, before the loose silk 
was taken off preparatory to winding, 16 grains 
and 289-1000ths. 
Weight of 100 cocoons, after the loose silk was 
taken off preparatory to winding, 1587 grains 
and 8-10ths. 
Average weight of cocoon, after the loose silk was 
taken off preparatory to winding, 15 grains and 
878-1000ths. 
Weight of 100 full chrysalides, 1437 grains. 
Average weight of full chrysalis, 14 grains and 
37-100ths. 
Weight of 100 empty chrysalides, 20 grains and 
9-10ths. 
Average weight of empty chrysalis, the 209-1000th 
part of a grain. 
Weight of 100 moths half male and half female, 
735 grains. 
Average weight of males, 4 grains and 7-10ths. 
Average weight of females, 10 grains. 
Weight of 100 eggs, 1 grain and 3-10ths. 
Average Weight of one egg, the 13-1000th part 
of a grain. 
These 100 silkworms produced 100 moths, 40 of 
which were males, and 60 females. They 
weighed 871 grains and 4-10ths. 

