• PREPARING WOODY TISSUES FOR MAKING MICROSCOPIC MOUNTS By

In order to cut thin sections of wood for micro-scopic study or for photomicrography it is important to se-lect and to treat the material to be sectioned with great care. Thick, imperfect sections may be prepared simply by wetting the surface of the wood to be cut and by using a sharp hand razor. Such sections, however, are usually not thin or uniform enough or do not present a large enough field to be photographed with good results and have only a temporary value. For exacting work permanent sections 5 to 25 micra thin, stained and mounted on a glass slide are de-sirable. The wood may be collected at any time of the year, but it is preferable to cut the samples when the leaves and flowers or fruit are on the trees so as to have reinforced evidence as to the identity of the samples. Whenever pos