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Vegetable secretions and the means by which by are effected by Kate L. Hudson, 1888

Vegetable secretions and the means by which by are effected by Kate L. Hudson, 1888, Page 44

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40 of the root and Fig. 3. a longitudinal section of the same. In the first figure the tubes (a) appear only to be groups of thick walled cells, but a longitudinal section as Fig. 3. shows them to be tubes (a) which ramify through the plant tissues. The oil ducts found in the various umbelliferae afford an interesting study of glands and glandular secretions. The fruit is very important in this order as are also the glands found in it, for the fruit with its variously arranged oil-ducts, generally characterize the species. The main things which furnish characters for
 
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