The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 144 VEGETABLE LIFE AND WORK. [SECTION 16. of Houseleek. The epidermis is usually composed of a siugle layer, occa- sionally of two or three layers, of empty s p~—-p-—--n cells, mostly of irregular outline. The sin- / uous lines which traverse it, and may be dis- 7

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