The American Naturalist, 34. köideEssex Institute, 1900 |
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Page vii
... nerve fibres Bancroft on tunicates Barker's nervous system Barnes , Outlines of plant life . 905 71 607 , 905 335 · 429 63 . 71 61 Pennaria , Natural history of 387 Bauer's experimental petrogra- Petrographical notes 161 , 455 phy . 160 ...
... nerve fibres Bancroft on tunicates Barker's nervous system Barnes , Outlines of plant life . 905 71 607 , 905 335 · 429 63 . 71 61 Pennaria , Natural history of 387 Bauer's experimental petrogra- Petrographical notes 161 , 455 phy . 160 ...
Page ix
... nerve cells of the human cortex Thompson's ( Seton ) trail of the sandhill stag • Towle , Heliotropism of Cypri- dopsis Trimen's flora of Ceylon Tzwetaew's carboniferous cephalopods of Russia • 439 . 312 • 233 . 826 899 65 319 • 603 447 ...
... nerve cells of the human cortex Thompson's ( Seton ) trail of the sandhill stag • Towle , Heliotropism of Cypri- dopsis Trimen's flora of Ceylon Tzwetaew's carboniferous cephalopods of Russia • 439 . 312 • 233 . 826 899 65 319 • 603 447 ...
Page 4
... vestigial , anterior , cervical nerve belonging to the degenerate " proatlas " vertebra would be fatal to the above hypothesis . A likelier rachitomous prototype is that afforded by Disco- saurus 4 [ VOL . XXXIV . THE AMERICAN NATURALIST .
... vestigial , anterior , cervical nerve belonging to the degenerate " proatlas " vertebra would be fatal to the above hypothesis . A likelier rachitomous prototype is that afforded by Disco- saurus 4 [ VOL . XXXIV . THE AMERICAN NATURALIST .
Page 62
... nerve cells are as distinct from one another in the beginning as any other cells ; thirdly , the nutrition of the nervous elements , as shown in their degeneration , etc. , is most readily understood on the grounds of this theory ; and ...
... nerve cells are as distinct from one another in the beginning as any other cells ; thirdly , the nutrition of the nervous elements , as shown in their degeneration , etc. , is most readily understood on the grounds of this theory ; and ...
Page 63
... nerve fibres is only touched , and the differentiation of the various forms of nerve cells receives little attention . A very full account of the segmental arrangement of the spinal nerves and their relation to the muscula- ture is ...
... nerve fibres is only touched , and the differentiation of the various forms of nerve cells receives little attention . A very full account of the segmental arrangement of the spinal nerves and their relation to the muscula- ture is ...
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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 larvæ lateral legs length limbs male margin maxillipeds median Museum neurone neurone theory neuropile normal North nucleus observed organs pair of antennæ 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.