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and Leipzig: the seed of the Black In England will do for the northern 
parts of England; but for Scotland I should rather obtain them from Pome¬ 
rania and Prussia. 
3. That the seeds should be sown in plain but light garden-land, rather 
somewhat sandy, without any dung whatever. The Rev. Mr. Swayne, in 
your tenth volume, guesses right when he attributes the loss of his plants to 
the dung. 
4. That I doubt the mode of cuttings to multiply the Mulberry-tree. I 
© 
will make, next spring, a trial in the open air, and in a green-house without 
heat; yet 1 think it likely to fail; but to raise plants from Seeds seems more 
eligible, especially if taken from a northern clime, as proposed above. 
5. That, to all those that will undertake to raise Silkworms, an excessive 
cleanliness should be recommended: no draught of air, no smoke, damp 
vapour, or exhalation whatever, should come near them; nor even a sickly 
person approach them. 
6. That no sun-shine, but only a temperate or broken light, should come 
upon them; the heat of the room should be between twelve and fifteen of 
Reaumur: airing more than once, especially in the morning, is necessary. 
The room should have shutters, to secure them from the effect of thunder 
and lightning; consequently the bringing them into the air, as proposed by 
the Rev. Mr. Swayne, I dare not adopt; besides, the carrying the apparatus 
into the garden, and back into the house, is an unnecessary labour, requiring 
hands. The apparatus is really a good one, resembling some I have seen 
formerly in Italy, and this last summer beyond Kiovia, at two estates of 
Field-Marshal Count Rasoumouzky, who has Mulberry plantations, I got 
this summer about twenty pounds of pretty good Silk. 
7 • That the rearing of Silkworms will take no labourer from the field, 
nor from any manufacture: it will employ only an elderly woman and a 
couple of children, of twelve, thirteen, or fourteen years of age, the gather¬ 
ing of the leaves excepted, which will employ one lad of fifteen; all these 
will rear thirty thousand \Vk>rms, or more, in the term of six or seven weeks, 
producing ten pounds of Silk. 
8. That for the Mulberry-tree no good land is required, but such as will 
grow the most common trees on dry land; nay, I will venture to assert, 
they will grow on Blackheath, on Hounslowheath, on Finchley Common, 
and even on the barren Marlborough Downs. To these hints I must add, 
