The American Naturalist, 34. köideEssex Institute, 1900 |
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Page iii
... Structure in the mammalian egg • 320 Bones , Arrangement of collections 9 Botanical Notes , 75 , 241 , 449 , 6c8 , 680 , The tree - frog 322 767 , 828 , 907 , 989 Animal and plant colors 759 Botany , Briefer courses in 905 Annelids ...
... Structure in the mammalian egg • 320 Bones , Arrangement of collections 9 Botanical Notes , 75 , 241 , 449 , 6c8 , 680 , The tree - frog 322 767 , 828 , 907 , 989 Animal and plant colors 759 Botany , Briefer courses in 905 Annelids ...
Page 41
... structure of the flowers is very similar to that of the preceding species . The perfume is distinct , and the flowers contain honey . Visitors : Hymenoptera - Andrenid¿ : ( 1 ) Andrena vicina Sm . , ; ( 2 ) Halictus palustris Rob ...
... structure of the flowers is very similar to that of the preceding species . The perfume is distinct , and the flowers contain honey . Visitors : Hymenoptera - Andrenid¿ : ( 1 ) Andrena vicina Sm . , ; ( 2 ) Halictus palustris Rob ...
Page 57
57 problems of the day . The opening lecture is on the structure of protoplasm , by E. B. Wilson , whose study of the living echinoderm egg has led him to revise his former opinion and declare himself now in favor of the alveolar structure ...
57 problems of the day . The opening lecture is on the structure of protoplasm , by E. B. Wilson , whose study of the living echinoderm egg has led him to revise his former opinion and declare himself now in favor of the alveolar structure ...
Page 59
... structures , " but these include the scales of tele- osts which , in their completed state , are entirely mesenchymatous , and also the scales of Selachians which possess a double origin . The subject of teeth , though strictly ...
... structures , " but these include the scales of tele- osts which , in their completed state , are entirely mesenchymatous , and also the scales of Selachians which possess a double origin . The subject of teeth , though strictly ...
Page 63
solution till more definite knowledge can be gained of the structure of cells in general . To us it seems that the nerve cell is one of the best cells in which these problems can be attacked . The section on the histogenesis of nerve ...
solution till more definite knowledge can be gained of the structure of cells in general . To us it seems that the nerve cell is one of the best cells in which these problems can be attacked . The section on the histogenesis of nerve ...
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Common terms and phrases
abdomen Acad American anatomy angle animal appears basal birds body botany branch Bulletin Carapace cardinal vein cavity cells character collection color common iliac vein condition Crustacea described diameter disk dorsal Eciton ectoderm eggs elongate embryo Eremobates external eyes fauna female flagellum flowers frog fungus ganglion genera Genus gills gland gonidia granules head hooks inner insects intercentrum intestine joint Journ Lake larv¿ lateral legs length limbs male margin maxillipeds median Museum neurone neurone theory neuropile normal North nucleus observed organs pair of antenn¿ paper Pelomyxas plants plates portion posterior present Proc Professor protoplasm pseudopodia Rathbun region ridges side species specimens spines statoblasts Stimpson stolon structure suckers surface tadpoles tentacles Terminal segment thorax tion tissue U. S. Nat uropoda valve variation vein ventral vertebrates villi Zapus Zool zoology
Popular passages
Page 75 - The Cretaceous formation of the Black Hills as indicated by the fossil plants (with the collaboration of WP Jenney, WM Fontaine, and FH Knowlton).
Page 571 - ... at least a cubic yard in bulk, and contained hundreds of thousands of individuals, although many columns were outside, some bringing in the pupae of ants, others the legs and dissected bodies of various insects. I was surprised to see* in this living nest tubular passages leading down to the centre of the mass, kept open just as if it had been formed of inorganic materials. Down these holes the ants who were bringing in booty passed with their prey. I thrust a long stick down to the centre of...
Page 570 - Such a column is of enormous length, and contains many thousands if not millions of individuals. I have sometimes followed them up for two or three hundred yards without getting to the end. They make their temporary habitations in hollow trees, and sometimes underneath large fallen trunks that offer suitable hollows. A nest that I came across in the latter situation was open at one side. The ants were clustered together in a dense mass, like a great swarm of bees, hanging from the roof, but reaching...
Page 441 - ... old, migration could become in time a ruling Habit in the life of a last summer's bird, holding it true to route and period of movement. In short, it is believed that the causes of migration are simple facts and not impenetrable mysteries lying beyond the domain of scientific enquiry. Summary. — To sum up the whole matter in a single sentence : It is held that bird migration is a habit evolved by education and inheritance which owe their origin and perpetuation to winter with its failure of...
Page 804 - Mr. WA Cannon,* in discussing a Cecidomyid gall on the Monterey pine, says that the "larvae take their food only by absorption through the surface of the body...
Page 201 - Maine.) TYPE LOCALITY. — Hudson Bay. RANGE. — From the southern shores of Hudson Bay south to New Jersey, and in the mountains to North Carolina, west to Iowa and Missouri, and northwest to Alaska.
Page 87 - The Latimer Collection of Antiquities from Porto Rico, in the National Museum at Washington, DC By OTIS T.
Page 123 - ... the trunk which has hence been designated the branchiogenital region. A theory of gill-slits was developed, according to which gillslits arose in the interannular depressions while the gonads were disposed in zones corresponding with the epidermal annulations. The primary function of the gill-slits was the oxygenation of the gonads, their secondary function being the respiration of the individual.
Page 245 - ... consortia, that it is more convenient to treat them as a separate class. In the formation of the thallus the algal cells become enveloped by the mycelium of the fungus in a felted tissue of hyph;e (Fig.
Page 210 - ... carpus attenuated, hand very large, oblong, finger elongate and curved, immovable, strongly tuberculate within. Thoracic appendages not specialized into an anterior and a posterior series. Marsupium of female formed of eight large lamellae from the four first free segments.