Out-door recreation in the garden may be fully studied in the article Horticulture (Vol. 13, p. 741), which is a book in itself, for its contents are the equivalent of about 140 pages of this Guide. It is written by Liberty Hyde Bailey, director of the College of Agriculture, Cornell University, who contributes a valuable gardeners’ calendar for the United States, M. T. Masters, editor of Gardeners’ Chronicle, and W. R. Williams, superintendent of the London County Council Botany Centre, who write on “principles”; and John Weathers, author of Practical Guide to Garden Plants, who writes on the “practice” of gardening. The following is a partial list of the topics treated in this article:

Roots, Root-Pruning and Lifting, Watering, Bottom-Heat; Stem; Leaves; Buds; Propagation by Buds; Layering; Grafting or “Working”; Planting; Pruning; Training; Sports or Bud Variations; Formation of Flowers; Forcing; Retardation; Double Flowers; Formation of Seed, Fertilization, Hybridization, Reversion, Germination, Selection—all to be supplemented by the article Botany (Vol. 4, p. 299) for more scientific and less practical discussion of these topics.

The Practice of Horticulture.

Formation and Preparation of the Garden—Site, Soil, Subsoil, Shelter, Water Supply, Fence, Walks, Edgings.

Garden Structures—Walls, Espalier Rails and other means of training; Plant Houses (with 12 illustrations), including Conservatory, Greenhouse, Fruit House, Vinery, Peach House, Forcing House, Pits and Frames, Mushroom House, Fruit Room, Heating Apparatus, Pipes, Boilers, Water Supply, Solar Heat, Ventilation, etc.

Garden Materials and Appliances—Soil, Loam, Sand, Peat, Leaf Mould, Composts. Manures, with descriptions and appraisals of different varieties, organic and inorganic. Tools, Tallies and Labels.

Garden Operations—Propagation—by seeds, offsets, tubers, division, suckers, runners, proliferous buds, grafts, with description and diagrams of different methods—buds, branch cutting, leaf cutting, root cutting, single-eye cutting, with 12 illustrations.

Planting and Transplanting; Watering; Pruning (with 9 illustrations); Ringing; Training—horizontal, fan, trellis, etc.

Flowers—Flower Gardens, Pleasure Grounds, Lawns; Hardy Annuals, with long list and description of plants recommended; Hardy Biennials, with list; Herbaceous Perennials, with classified list (containing more than the equivalent of 18 pages of this Guide); Hardy Trees; Bedding Plants, etc.

Vegetables.