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Attention must be paid to the following particulars in using the Instrument for cutting transverse slices of wood for Microscopial Observations.

The wood to be cutt must be made perfectly clean, and if the Bark be any how rough or ragged it must be well washed with a soft brush in plenty of water; Otherwise. it will impair the edge of the cutter.

If the wood to be cutt is not fresh from the tree it must be moistened with Spirits, the application of which must be repeated to the end of the wood so often as it appears dry.

In cutting the wood of a proper length for the instrument, great care must be taken that it's ends be not split or any how lacerated; Otherwise the slices cut from it will be very imperfect, altho the instrument be in good order.

The lower, as well as the upper end of the wood, must be made perfectly flat, that it may rest solidly on the piece of ivory which raises it towards the cutter: Otherwise, it will move by jerks and render many of the slices imperfect.

In flatning the end of the wood, the slices taken off must not exceed the 500 of an inch, least the Edge should be hurt by their too great thickness.