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night and day, when it froze to hard; that the Sap congealed as fast as it issued our. The Cold remitting, the Birches bled afresh, the Sycamores abated very much, and the Walnut-trees quite ceased.
12. We pierced two Sycamores on the North and Southsides, and both of them from equall incisions bled a greast deale faster from the North-sides, than the South, which is consonant to the preceding Experiment.
13. We set several Willows with the wrong ends downward; and cut off several Bryars, that had taken root at the small ends. This 29th of May the Willows have shot out Branches neare two foot long; and from the top of the Sets, which were a yard high, the Bryars have also grown backwards from that part, which we left remaining to the roots at the lesser ends; they have great leaves and are ready to flower.
An Extract of a Letter
SIr, having been lately in the Copper, Silver, and Gold-mines in Hungary, I hope ere long to give you a particular account thereof; presenting this in the mean time concerning Damps in these Mines; whereof I understand, that they happen in most of them, that are deep; and that they happen not only in the Cunicili or direct pall ages, where they walk on Horizontally (by these Mine-men call'd Stollen) but also in the Putei or Perpendicular Cutts or Descents (term'd Schachts by the same.) They are met with not only in places, where the Earth is full of Clay or the like substances, but also where it is Rocky: and one place they shew'd me in the Copper-mine at Hern-groundt, where there had been a very pernicious damp, and yet the Rock so hard, that it could not be broken by their Instruments; but the descent was all made by the means of Gun-powder, ram'd into long round holes in the Rock, and so blowne up. Another place they show'd me, where there is sometimes a damp, and sometimes clear weather. When there is much water in
