The edges can be sealed with a solution of dammar in xylol or better with melted soft paraffin. Suggestions for making preparations from different plant and animal tissues are given, including the use of chloral hydrate for clearing pollen-grains, and a method for mounting iron-acetocarmine preparations in Canada balsam. The author''s experience is listed in preparing the pollen mother cells and young microspores of Canna, Zea, Nicotiana, Datura, Hyacinthus, Triticum, Secale, Tradescantia, Uvularia, Hosta, Cypripedium, Scilla, Narcissus and Galanthus.