«0 On preferring Seeds of Plants 



cond gallery in the firft, opens up a new field of Supply. In 

 this manner iron-done is continued to be raifed, till fuch 

 time as the f 'eld is totally exhaufted. 



Thefe extenfive excavations commonly collect a confider- 

 Uble quantity of water, which would foon impede the pro- 

 grefs of the workmen : various means have been contrived 

 to remove this consequent obstruction. Thefe have chiefly 

 confifted in running a counter gallery as far to the declivity 

 of the metals as poffible, and of pairing the water into it by 

 means of filtration, or communications betwixt gallery and 

 gallery. Where a fufficient quantity of running water pre- 

 sents itfelf, water-wheels have been applied, to extract the 

 water from one general refervoir by means of pumps. 



Strata of iron-ftone are from \ an inch to ia inches iq 

 thicknefs. Thofe of 3, 4, 5 and 6 inches are mofl com- 

 monly met with ; they are alfo reckoned to contain a 

 quantity and quality of iron Superior to larger bands. Ball 

 and lunker iron-ftone, however large, contain always a 

 fuperior quantity of iron, and are eafier reduced in the 

 blaft-furnace. 



IV. On Preferring Seeds of Plants in a State fit for Vegeta- 

 tion. By John Sneyd, Efq. of Belmont, Stafford/hire. 

 From the Tranfactions of the Society for the Encourage- 

 ment of Arts, &c. Vol, XVI, 



M. 



.ANY years ago having obfervcd fome feeds which had 

 got accidentally amongft raifins, and that they were fuch as 

 are generally attended with difficulty to raife in England 

 after coming in the ufual ivay from abroad, I fowed them in 

 pots, within a framing; and as all of them grew, I com- 

 miffioned my foris, who were then abroad, to pack up all 

 forts of feeds they could procure in abforbent paper, and 

 fend fome of them furrounded by raifins, and others by 



; brown 



