. Popular science monthly. Fig. 18. Fig. 19. and in such cases they often assume a cimeter-like form. This I wouldventure to suggest may be in consequence of one side being turned out-ward, and therefore under more favorable conditions. In one very interesting species [Acacia melanoxylon, Fig. 17), the 356 THE POPULAR SCIENCE MONTHLY. plant througliout life produces both forms, and on the same bough may-be seen phyllodes interspersed among ordinary pinnate leaves, the re-spective advantages being, it would appear, so equally balanced thatsometimes the one, sometimes the other, secures the pred
. Popular science monthly. Fig. 18. Fig. 19. and in such cases they often assume a cimeter-like form. This I wouldventure to suggest may be in consequence of one side being turned out-ward, and therefore under more favorable conditions. In one very interesting species [Acacia melanoxylon, Fig. 17), the 356 THE POPULAR SCIENCE MONTHLY. plant througliout life produces both forms, and on the same bough may-be seen phyllodes interspersed among ordinary pinnate leaves, the re-spective advantages being, it would appear, so equally balanced thatsometimes the one, sometimes the other, secures the predominance. In the case of the eucalyptus, every one who has been in the southof Europe must have noticed that the young trees have a totally dif-ferent aspect from that which they acquire when older. The leaves ofthe young trees (Fig. 18) are tongue-shaped, and horizontal. In olderones, on the contrary (Fig. 19), they hang more or less vertically, withone edge toward the tree, and are cimeter-shaped, with the convexedge out
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
