. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada . Botany; Botany; Botany. ' 92, 93, 94, showing the course of the spiral threiitl .ind the order of the leaf-succession in the axes of elm, alder, and cherry. 95, axis of Osage-orange with a section of tlie barit peeled, dis- playing the order of the leaf-scars (cycle |). 229. The elm cycle. Inthestrictly alternate arrangement (elm, linden, grasses) the spiral thread makes one complete circuit and commences a new one at the third leaf The third leaf s
. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada . Botany; Botany; Botany. ' 92, 93, 94, showing the course of the spiral threiitl .ind the order of the leaf-succession in the axes of elm, alder, and cherry. 95, axis of Osage-orange with a section of tlie barit peeled, dis- playing the order of the leaf-scars (cycle |). 229. The elm cycle. Inthestrictly alternate arrangement (elm, linden, grasses) the spiral thread makes one complete circuit and commences a new one at the third leaf The third leaf stands over the first, the fourth over the second, and so on, forming two vertical rows of leaves. Here (caUing each complete circuit a cych) we observe 230. First, That this cycle is composed of two leaves; second, that the angu- lar distance between its leaves is J a cycle (180°); third, if we express this cycle mathematically by J, the numerator (1) will denote the turns or revolutions, the de- nominator (2) its leaves, and the fraction itself the angular distance between the leaves(Jof360o).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wood, Alphonso, 1810-1881. New York : A. S. Barnes & Burr
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisher, booksubjectbotany
