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Mr. Howard's Account of a Microscopical Investigation
3. Whether the germ or embryo of the seed, previous to the impregnation, contains it.
4. In what manner the pollen of plants in general will be acted upon by the liquor from the nectary, when exposed to it in circumstances similar to those of Exp. 4.
5. And lastly, to investigate the varieties in form and structure of the different species of pollen; and to examine how far they agree or differ in the several species of each genus, and genera of each natural order.
IV. Observa-
