Essentials of Biology Presented in Problems: By George William HunterAmerican book Company, 1911 - 448 páginas |
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Página 38
... glands . Sprengel further discov- ered the fact that pollen could be and was carried by the insect visitors from the anthers of the flower to its stigma . It was not until the middle of the nineteenth century , however , that an ...
... glands . Sprengel further discov- ered the fact that pollen could be and was carried by the insect visitors from the anthers of the flower to its stigma . It was not until the middle of the nineteenth century , however , that an ...
Página 42
... glands . The nectar glands are usually so placed that to get to them the insect must first brush the stamens and pistil of the flower . Frequently the location of the nectaries ( nectar glands ) m 9 a is made conspicuous by brightly ...
... glands . The nectar glands are usually so placed that to get to them the insect must first brush the stamens and pistil of the flower . Frequently the location of the nectaries ( nectar glands ) m 9 a is made conspicuous by brightly ...
Página 131
... glands , which pour out a fluid capable of digest- ing proteid food . Thus an insect , caught between the halves of the leaf blade , is held there and slowly digested . Sundew . In the sundew the leaves are covered with long glandular ...
... glands , which pour out a fluid capable of digest- ing proteid food . Thus an insect , caught between the halves of the leaf blade , is held there and slowly digested . Sundew . In the sundew the leaves are covered with long glandular ...
Página 196
... glands which secrete the saliva of the mos- quito . When the mosquito pierces its human prey a second time , some of the parasites are introduced into the blood along with the saliva . These para- sites enter the corpuscles of the blood ...
... glands which secrete the saliva of the mos- quito . When the mosquito pierces its human prey a second time , some of the parasites are introduced into the blood along with the saliva . These para- sites enter the corpuscles of the blood ...
Página 206
... glands connected with it . The enzymes in the fluids secreted by the latter change the foods from a solid form ( usually insoluble ) to that of a fluid . Such fluid may then pass by osmosis through the walls of the food tube into the ...
... glands connected with it . The enzymes in the fluids secreted by the latter change the foods from a solid form ( usually insoluble ) to that of a fluid . Such fluid may then pass by osmosis through the walls of the food tube into the ...
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Pasajes populares
Página 405 - 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 405 - 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 405 - 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 405 - 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 405 - 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 347 - In small doses these substances are oxidized in the body and yield a corresponding amount of energy, but their value from this standpoint is altogether unimportant compared with their action as stimulants. Alcohol also, when not taken in too large quantities, may be oxidized in the body, and furnish a not inconsiderable amount of energy. It is, however, a matter of controversy at present whether alcohol in small doses can be considered a true foodstuff, capable of serving as a direct source of energy,...
Página 427 - A healthy mental attitude implies many elements, but they are all roughly summed up in the word "serenity." Probably no other one hygienic requirement is of greater importance than this. Moreover, the attitude of "healthymindedness" should be striven for not only in order to produce health, but as an end in itself, for which, in fact, even health itself is properly sought. In short the health of the body and the health of the mind act and react on each other.
Página 14 - It is within the power of man to cause all parasitic diseases to disappear from the world.
Página 414 - In like manner the influence of all drugs which affect the nervous system must be in the direction of disintegration. The healthy mind stands in clear and normal relations with Nature. It feels pain as pain. It feels action as pleasure. The drug which conceals pain or gives a false pleasure when pleasure does not exist forces a lie upon the nervous system.