. The standard cyclopedia of horticulture; a discussion, for the amateur, and the professional and commercial grower, of the kinds, characteristics and methods of cultivation of the species of plants grown in the regions of the United States and Canada for ornament, for fancy, for fruit and for vegetables; with keys to the natural families and genera, descriptions of the horticultural capabilities of the states and provinces and dependent islands, and sketches of eminent horticulturists . rthy that this change is an immediate fore-runner of leaf-fall and death. The vegetation that issuddenly c
. The standard cyclopedia of horticulture; a discussion, for the amateur, and the professional and commercial grower, of the kinds, characteristics and methods of cultivation of the species of plants grown in the regions of the United States and Canada for ornament, for fancy, for fruit and for vegetables; with keys to the natural families and genera, descriptions of the horticultural capabilities of the states and provinces and dependent islands, and sketches of eminent horticulturists . rthy that this change is an immediate fore-runner of leaf-fall and death. The vegetation that issuddenly cut off by severe frost seldom exhibits trueautmnnal colors, but instead the dry bromi or black-ened effects of rapid death, characteristic of any sea-son. On the other hand, autumn tints of leaves mayappear in the summer, as when hmbs of the hard mapleor peach are ringed. This suggests that the produc-tion of color is susceptible of experimental study. Onthe whole, the layman may regard the autumn colorsas a necessity to the wholesome rounding out, and afitting terminus, of a season of \isefulness. Colorationis, however, an evidence of fundamental physiologicalchanges; and it is appropriate to ask regarding theclimatic or other conditions which bring this about, aswell iis concerning the nature of these internal changeswhich also make for the development of color in theautumn. For the part, the autiunn leaf-colors fall intotwo groups—yellows and reds. These colors are pro-. Auricula duced by two groups of pigments essentially different inchemical and physical (jroperties; yet these pigmentsare frequently blended in the same leaf, yielding suchgorgeous effects as be seen in the sumach. The yellow pigment (more correctly pigments) ofleaves occurs in the chlorophyll bodies of the cell. It ispresent in conjunction witli the leaf-green in thehealthy leaf, but not infrequently it seems to increasein quantity as the chlorophyll disappears. It belongs toa group of substanc
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectgardening
