The Advancement of Science: Occasional Essays & AddressesMacmillan, 1890 - 387 |
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Strona 14
... young born of one species are not exactly alike but some larger , some smaller , some lighter , some darker , some short - legged , some big - eyed , some long - tongued , some sharp - toothed , and so on - furnishes the opportunity for ...
... young born of one species are not exactly alike but some larger , some smaller , some lighter , some darker , some short - legged , some big - eyed , some long - tongued , some sharp - toothed , and so on - furnishes the opportunity for ...
Strona 18
... young are a brief recapitulation of the phases of form through which the ancestors of the young creature have passed . In some animals this recapitulation is more , in others it is less complete . Sometimes the changes are hurried ...
... young are a brief recapitulation of the phases of form through which the ancestors of the young creature have passed . In some animals this recapitulation is more , in others it is less complete . Sometimes the changes are hurried ...
Strona 19
... young of the Common Frog . 1 , Recently hatched ( twice natural size ) ; 2 and 2a , same enlarged to show the external gills ; 3 and 4 , later stages with gill - slits covered by a membrane leaving only the spiracle ( see Fig . 16 ) as ...
... young of the Common Frog . 1 , Recently hatched ( twice natural size ) ; 2 and 2a , same enlarged to show the external gills ; 3 and 4 , later stages with gill - slits covered by a membrane leaving only the spiracle ( see Fig . 16 ) as ...
Strona 28
... young stages of a number of shrimp- like animals , viz . Sacculina , Lernæocera , Lepas , Cy- clops , Limnetis ( all drawn in Fig . 4 ) , some of which lead a parasitic life . All start equally with the re- capitulative phase known as ...
... young stages of a number of shrimp- like animals , viz . Sacculina , Lernæocera , Lepas , Cy- clops , Limnetis ( all drawn in Fig . 4 ) , some of which lead a parasitic life . All start equally with the re- capitulative phase known as ...
Strona 29
... YOUNG CIRRIPDE PUPA FIG . 10. - Development of Cirrhipedes ( Bar- nacle and Sea - acorn ) . After Huxley . Amongst these Nauplii - all belonging to the great group Crustacea , which includes crabs and shrimps- is one which gives rise to ...
... YOUNG CIRRIPDE PUPA FIG . 10. - Development of Cirrhipedes ( Bar- nacle and Sea - acorn ) . After Huxley . Amongst these Nauplii - all belonging to the great group Crustacea , which includes crabs and shrimps- is one which gives rise to ...
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