Heredity And Evolution in Plants
Heredity And Evolution in Plants
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Scharff, R. F. Proc. Royal Irish Acad. 28: 13. Nov. , 1909.
GEOGRAPHICAL DISTRIBUTION 157 Among the plants may be mentioned ladies' tresses (Spi- ranthes Romanzoffiana) and the seven-angled pipewort (Eriocaulon septangulare) ; and among animals, the land snail, Helix hortensis.
FIG. 73. Asa Gray (1810-1888). Noted American botanist and student of plant geography.
Of the various theories which have been advanced to explain the occurrence of identical species on opposite shores of the North Atlan...tic, Scharff enumerates the following three. 1 i. Migration from Europe across Asia and a Bering Strait land-bridge to America, or vice versa.
1 Scharff, Robert Francis. On the evidences of a former land bridge be- tween northern Europe and North America. Proc. Royal Irish Acad. 288:1-28. Nov. , 1909.
158 HEREDITY AND EVOLUTION IN PLANTS 2. Occasional transport by birds across the Atlantic Ocean.
3. Migration across a direct Atlantic land-connection. Human agency is generally rejected, except in cases where it can positively be demonstrated.
What to read after Heredity And Evolution in Plants?
You can find similar books in the "Read Also" column, or choose other free books by Gager, C. Stuart (Charles Stuart), 1872-1943 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Scharff, R. F. Proc. Royal Irish Acad. 28: 13. Nov. , 1909.
GEOGRAPHICAL DISTRIBUTION 157 Among the plants may be mentioned ladies' tresses (Spi- ranthes Romanzoffiana) and the seven-angled pipewort (Eriocaulon septangulare) ; and among animals, the land snail, Helix hortensis.
FIG. 73. Asa Gray (1810-1888). Noted American botanist and student of plant geography.
Of the various theories which have been advanced to explain the occurrence of identical species on opposite shores of the North Atlan...tic, Scharff enumerates the following three. 1 i. Migration from Europe across Asia and a Bering Strait land-bridge to America, or vice versa.
1 Scharff, Robert Francis. On the evidences of a former land bridge be- tween northern Europe and North America. Proc. Royal Irish Acad. 288:1-28. Nov. , 1909.
158 HEREDITY AND EVOLUTION IN PLANTS 2. Occasional transport by birds across the Atlantic Ocean.
3. Migration across a direct Atlantic land-connection. Human agency is generally rejected, except in cases where it can positively be demonstrated.
What to read after Heredity And Evolution in Plants?
You can find similar books in the "Read Also" column, or choose other free books by Gager, C. Stuart (Charles Stuart), 1872-1943 to read onlineMoreLess
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