Elements of Biology: A Practical Text-book Correlating Botany, Zoology, and Human PhysiologyAmerican Book Company, 1907 - 445 páginas |
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Página 5
... young students in the first year of the high school . The average age of such pupils is about fourteen years . To such pupils the life activities of plants and animals have an appealing interest ; simple experiments in plant physiology ...
... young students in the first year of the high school . The average age of such pupils is about fourteen years . To such pupils the life activities of plants and animals have an appealing interest ; simple experiments in plant physiology ...
Página 24
... young plants of the same kind . Organs . Each part of a plant or animal , having a separate work or function , is known as an organ . The arms and legs of a man are familiar examples of organs . A thing made up of organs is called an ...
... young plants of the same kind . Organs . Each part of a plant or animal , having a separate work or function , is known as an organ . The arms and legs of a man are familiar examples of organs . A thing made up of organs is called an ...
Página 40
... young and old flowers and fruits are all on the same cluster . Where are the youngest flowers located in the cluster ? Is there any flower at the end of the main stalk ? Could you determine in advance the length of the flower cluster ...
... young and old flowers and fruits are all on the same cluster . Where are the youngest flowers located in the cluster ? Is there any flower at the end of the main stalk ? Could you determine in advance the length of the flower cluster ...
Página 43
... young hatch out and feed on the young seeds which have been fertilized by the pollen placed on the stigma by the mother . They eat some of the developing seeds and then bore out of the seed pod and escape to the ground , leaving the ...
... young hatch out and feed on the young seeds which have been fertilized by the pollen placed on the stigma by the mother . They eat some of the developing seeds and then bore out of the seed pod and escape to the ground , leaving the ...
Página 50
... young seeds . Study of Bean or Pea Fruit . - The pod of the pea or string bean will show us these facts more clearly . Examine , and then draw , natural size , an un- The walls of the pod are called valves . Show the ing your drawing ...
... young seeds . Study of Bean or Pea Fruit . - The pod of the pea or string bean will show us these facts more clearly . Examine , and then draw , natural size , an un- The walls of the pod are called valves . Show the ing your drawing ...
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Términos y frases comunes
adapted alcohol American Book Company amount animal arteries bacteria bean birds blood vessels bone Botany breathing called carbon dioxide cause 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 larvæ layer leaf leaves legs living lungs Manual means membrane microscope mollusks monocotyledon mouth muscles muscular nerve nervous system nitrogen Notice organs outer ovary oxidation oxygen parasitic pass Physiology pistil poison pollen proteid protoplasm root hairs seedlings seeds seen shell side skeleton skin soil species sporangium spores stamens starch starfish stem stomach stomata structure substance sugar surface teeth temperature tiny tion tissues tree veins vertebral vertebral column walls wings worm Zoology
Pasajes populares
Página 409 - 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. 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.
Página 409 - 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 409 - 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 fibres 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.
Página 319 - Men will barter gold for it ; indeed, among the Gallas and on the coast of Sierra Leone, brothers will sell their sisters, husbands their wives, and parents their children for salt. In the district of Accra, on the gold coast of Africa, a handful of salt is the most valuable thing upon earth after gold, and will purchase a slave or two. Mungo Park tells us that with the Mandingoes and Bambaras the use of salt is such a luxury that to say of a man, ' he flavors his food with salt...
Página 319 - ... 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— the...
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 328 - ... and spoils the health and the intellect. Short of drunkenness [that is, in those effects of it which stop short of drunkenness] , I should say, from my experience, that alcohol is the most destructive agent we are aware of in this country.
Página 409 - 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.
Página 328 - ... mostly oxidized in our body. . . . Alcohol is therefore, without doubt, a source of living energy in our body. But it does not follow from this that it is also a nutriment. To justify this assumption proof must be furnished that the living energy set free by its oxidation is utilized for the performance of a normal function. It is not enough that potential energy is transformed into living energy. The transformation must take place at the right time and place and at definite points in definite...