. stance of which plants are composed is found to consist of what is called cellular and vascidar tissue. The former is a conglomeration of thin membranous vesicles, united to one another, forming cells hke those seen in wheaten bread (fig. 9, a), endowed with the power of producing their like, and by that means increasing the bulk of the plant. The normal form may be con-

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbo, booksubjectbotany