The microscopic bodies produced in the antheridia (and called “sper-mat-o-zoids”), and that produced in the archegonia (and called the “o-o-sphere”), are designated by the term “gam-etes;” it is their union that constitutes “fertilization.” It can now be understood why this stage of the development of the moss plant, as outlined in the preceding paragraph, is designated by the term “gam-e-to-phyte;” it is the plant (or generation) that produces the gametes. It is in popular language the “moss” plant. [Illustration: Fig. 2.[3] ] Footnote 3: FIG. 2.—The growth or protonema (_pr._) from the spore (_Sp._), having rhizoids (_r_), and buds (_b_), from which stems develop. The fusion of the two gametes results in the production of the sexual spore, called the “o-o-spore;” it develops at once into the second generation, or second stage in the life-cycle of the moss plant, which is called the “spo-ro-phyte.” It consists of the seta and capsule; the lower end (“foot”) of the seta becomes early embedded and fixed in the tissue of the gametophyte, and from it is derived the nourishment necessary to complete the development of the sporophyte, or the plant that produces the numerous non-sexual spores. This “alternation of generations,”—that is, the alternation of gametophyte and sporophyte,—is not peculiar to Mosses, but occurs also in the Pter-id-o-phytes and Sper-mat-o-phytes. CLASSIFICATION OF THE VEGETABLE KINGDOM. I. Thal-lo-phytes; as the Slime-moulds, Bacteria, Common Algae (green Pond-scum, etc.), Marine Algae (“Sea-moss”), Moulds, Mildews, Smuts, Rusts, Mushrooms, Toadstools, Puffballs, etc. II. Bry-o-phytes; The Mosses and Liverworts. III. Pter-id-o-phytes; The Ferns, Club-mosses and Horsetails. IV. Sper-mat-o-phytes; The Gymnosperms (Pines, etc.) and Angiosperms (Monocotyls and Dicotyls). ORDERS OF MOSSES. 1. Sphag-na-les; the Bog-mosses or Sphagnum. 2. An-dre-æ-a-les; one genus of small Mosses in mountain regions. 3. Ar-chid-i-a-les; only one very short-stemmed species. 4. Bry-a-les; the common Mosses occurring in Ohio. The only book that could be used by beginners in identifying Mosses, is Grout’s “Mosses with a Hand-lens,” price $1.10; procure if wanted from the author, or if placed in our hands the order will be attended to. The Manual by Lesquereux and James could be used by advanced students. It is earnestly requested that contributions of Mosses for the STATE HERBARIUM from every County in Ohio be made. Please send an ample amount of each kind, enclosed in a temporary paper pocket or envelope; with each specimen lay a slip of paper or temporary label, giving _locality, date and collector’s name_, also any notes that are made with reference to habitat or habit of the plants. The donor’s name and other data will be placed on the permanent label accompanying the herbarium specimens. ADDITIONAL NOTE ON THE SYNDESMON INVOLUCRE.