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I. A Letter cf the curious Mr, Henry Barham, R. S. Soc. 
to Sir Hans Sloan, Bart, Vice-Prefident of the Royal 
Society; ghing feveral Experiments and Ohfervations 
cn the production of Silk-Worms, and of their Silk in 
^England, as made hy him lajt Summer, 
Worthy Sir^ 
A S you are the Patron of Induftry and encourager of 
Natural Experiments, I think you juftly claim the 
firft View of thefe fmall ones, I made upon Silk 
Wormsy the laft Summer. 
And altho’ they may have been done before by others in 
fome other parts of the World ; yet in all the Authors I 
have Read I do not find they make ufe of the fame Me- 
thod ; and I dare be bold to fay, that thefe following Ob- 
fervations and Experiments were never made in England 
with that Nicety, as 1 have done, and, fhall do if 1 live. 
It being the firft Attempt of this kind, it may come fhort 
of that compleat Methodical Manner it may be brought to 
hereafter ; the which I hope you’ll excufe. 
. After you ha»'e pecufed it ^'our felf, if you fee any thing 
in it worthy the Communicating to the Rojal Society (\z 
being defigtfd for the Publickj you may do me the Honour. 
J 3 ut I wholly fubmit to your Judgment and Opinion in this, 
as I do in all other things whatloever. 1 am, 
.• Tour bumble Servant 
Henry Barham. 
E xperiments made in Chel/ea Park, in the Months of May 
June and July 1719. 
l receiv’d a fmall parcel of Eggs from. 
Languedoc. 
May 6. Early in the Morning I found them. Hatcht of 
themfelves, the Wind fhifting in the Night from Nor- ^ 
therly to the Wefi .South erly\ changing the^ Air of.9:.fudd,enho 
Warm, two Days before the change of the Moon. 
Aftejc Feeding and Managing them according to Art, 
through the whole Courfe of their four Sickneffes, they 
were come to their State of Perfedion, being then as 
thick as a Man’s little Finger, and from 4 to f Inches long, of 
a yellowifix Colour,, and when held againft the Light, they - 
might 
