Elements of Biology: A Practical Text-book Correlating Botany, Zoology, and Human PhysiologyAmerican Book Company, 1907 - 445 páginas |
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Página 188
... nerves , and bones , must act together . A collection of tissues per- forming certain work is called an organ . Tissues in the Human Body . Every animal body above the protozoan is composed of a certain number of tissues . The cells ...
... nerves , and bones , must act together . A collection of tissues per- forming certain work is called an organ . Tissues in the Human Body . Every animal body above the protozoan is composed of a certain number of tissues . The cells ...
Página 189
... nerve cell ; D , bone - forming cell ; E , muscle cell ; F , fibrous connective cell . other cells , a substance like jelly , called intercellular substance . This stands in the same relation to the cells as does mortar to the bricks in ...
... nerve cell ; D , bone - forming cell ; E , muscle cell ; F , fibrous connective cell . other cells , a substance like jelly , called intercellular substance . This stands in the same relation to the cells as does mortar to the bricks in ...
Página 196
... nerve cells . They furnish the animal with path- ways of sensation and provide a means of coördinated movement . -cnc . -спс . D. Organs of Offense and Defense . If the cells of the outer part of the tentacle are examined under the ...
... nerve cells . They furnish the animal with path- ways of sensation and provide a means of coördinated movement . -cnc . -спс . D. Organs of Offense and Defense . If the cells of the outer part of the tentacle are examined under the ...
Página 204
... nerves to each arm , ending at the eye . of the feet , it can be seen that the body of the starfish is drawn forward a short distance . To release the tube foot water is pumped in from the ampulla by the process mentioned above . The ...
... nerves to each arm , ending at the eye . of the feet , it can be seen that the body of the starfish is drawn forward a short distance . To release the tube foot water is pumped in from the ampulla by the process mentioned above . The ...
Página 205
... nerve ring is cut , then the different rays do not act together , but one set of tube feet pull in one direction and those of another ray pull in another , thus preventing locomotion . At the extreme end of each ray the nerve is found ...
... nerve ring is cut , then the different rays do not act together , but one set of tube feet pull in one direction and those of another ray pull in another , thus preventing locomotion . At the extreme end of each ray the nerve is found ...
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Términos y frases comunes
adapted alcohol American Book Company amount animal arteries attached bacteria bean birds blood vessels bone Botany breathing called carbon dioxide cells color colorless corpuscles containing corn corpuscles cotyledons covered crayfish crustaceans developed dicotyledonous digestive eggs endosperm example experiment fibers fish flower fluid frog fruit germinate gills glands grain green grow growth heart heat Hunter and Valentine insects intestine kidney known laboratory large number larvć layer leaf leaves legs living lungs Manual material means membrane microscope mollusks monocotyledon mouth muscles muscular nerve nervous system nitrogen Notice organs outer ovary oxidation oxygen parasitic pass Physiology pistil pollen proteid protoplasm root hairs seedlings seeds seen shell side skeleton skin soil species sporangium spores stamens starch stem stomach stomata structure substance sugar surface teeth temperature tiny tion tissues tree veins vertebral vertebral column walls wings worm Zoology
Pasajes populares
Página 397 - Let no youth have any anxiety about the upshot of his education, whatever the line of it may be. If he keep faithfully busy each hour of the working day, he may safely leave the final result to itself. He can with perfect certainty count on waking up some fine morning, to find himself one of the competent ones of his generation, in whatever pursuit he may have singled out.
Página 397 - I won't count this time." Well ! he may not count it, and a kind Heaven may not count it ; but it is being counted none the less. Down among his nerve cells and fibers the molecules are counting it, registering and storing it up to be used against him when the next temptation comes.
Página 397 - Could the young but realize how soon they will become mere walking bundles of habits, they would give more heed to their conduct while in the plastic state. We are spinning our own fates, good or evil, and never to be undone. Every smallest stroke of virtue or of vice leaves its never so little scar. The drunken Rip Van Winkle, in Jefferson's play, excuses himself for every fresh dereliction by saying, 'I won't count this time!
Página 321 - He flavors his food with salt,' is to imply that he is rich, and children will suck a piece of rock-salt as if it were sugar. No stronger mark of respect or affection can be shown in Muscovy, than the sending of salt from the tables of the rich to their poorer friends.
Página 397 - The hell to be endured hereafter, of which theology tells, is no worse than the hell we make for ourselves in this world by habitually fashioning our characters in the wrong way.
Página 403 - The more purely intellectual qualities of the mind rarely escape being involved in the general disturbance [caused by alcohol]. The power of application, of appreciating the bearing of facts, of drawing distinctions, of exercising the judgment aright, and even of comprehension, are all more or less impaired. The memory is among the first faculties to suffer. . . . The will is always lessened in force and activity. The ability to determine between two or more alternatives, to resolve to act when...
Página 61 - Jimson weed, to the exclusion of all other forms of plant life. That this is not the case is due to the fact that only those seeds which are advantageously placed can develop ; the others will, for various reasons (lack of moisture to start the young seed on its Grain ; spikes of ened flowers.
Página 321 - No stronger mark of respect or affection can be shown in Muscovy, than the sending of salt from the tables of the rich to their poorer friends. In the book of Leviticus it is expressly commanded as one of the ordinances of Moses, that every oblation of meat upon the altar shall be seasoned with salt, without lacking ; and hence it Is called the Salt of the Covenant of God. The Greeks and Romans also used salt in their sacrificial cakes ; and it is still used in the services of the Latin church—...
Página 397 - Well! he may not count it, and a kind Heaven may not count it; but it is being counted none the less. Down among his nerve cells and fibers the molecules are counting it, registering and storing it up to be used against him when the next temptation comes. Nothing we ever do is, in strict scientific literalness, wiped out. Of course, this has its good side as well as its bad one. As we become permanent drunkards by so many separate drinks, so we become saints in the moral, and authorities and experts...
Página 103 - The sap carries water and plant-foods from the roots to the leaves and from the leaves to the growing parts of the tree. That is why it is so important to keep the bark from being injured, for if the bark is cut or bruised or bored into by insects, the tree loses sap and is weakened. 8.