Junior Science, Τόμος 2B.H. Sanborn & Company, 1921 - 571 σελίδες |
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Σελίδα 381
... bacteria , bacilli , and micro- cocci , all highly magnified . Bacteria ( see Fig . 238 ) are also a low order of plants . They have only one cell . They are reproduced very rapidly by division of cells , as the pleurococcus is ...
... bacteria , bacilli , and micro- cocci , all highly magnified . Bacteria ( see Fig . 238 ) are also a low order of plants . They have only one cell . They are reproduced very rapidly by division of cells , as the pleurococcus is ...
Σελίδα 397
... bacteria of a special kind , which have the power to unite the nitrogen of the air with oxygen and other substances and produce nitrogen compounds . The roots of the clover and other legumes provide homes for these bacteria , and then ...
... bacteria of a special kind , which have the power to unite the nitrogen of the air with oxygen and other substances and produce nitrogen compounds . The roots of the clover and other legumes provide homes for these bacteria , and then ...
Σελίδα 403
... bacteria colonies that grow upon their roots . We eat vegetables for their starch and for their minerals and growth substances , or vitamines . " 66 Cotton gives us cotton and cottonseed oil ; flax gives us linen and linseed oil . From ...
... bacteria colonies that grow upon their roots . We eat vegetables for their starch and for their minerals and growth substances , or vitamines . " 66 Cotton gives us cotton and cottonseed oil ; flax gives us linen and linseed oil . From ...
Σελίδα 415
... bacteria of decay , which get into a tree through a jagged , broken limb , or one that is improperly sawed off , or through an injured place on the trunk , and so cause the tree to rot . Have you seen shade trees treated by tree surgery ...
... bacteria of decay , which get into a tree through a jagged , broken limb , or one that is improperly sawed off , or through an injured place on the trunk , and so cause the tree to rot . Have you seen shade trees treated by tree surgery ...
Σελίδα 428
... bacteria . But in cold milk the bacteria cannot grow nearly so rapidly as in warm milk . This is the reason why there should be a refrigerator of some sort in every family in which there are children . Do you see the value of the ...
... bacteria . But in cold milk the bacteria cannot grow nearly so rapidly as in warm milk . This is the reason why there should be a refrigerator of some sort in every family in which there are children . Do you see the value of the ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
acid alcohol ameba animals arteries auricle bacteria become birds blood vessels body bones brain breathing called capillaries carbon dioxide carry cells cerebrum coil cold color compass connective tissue copper cords corn corpuscles covering dermis digestive tract eggs electric current epidermis epiglottis esophagus eyes feet ferments fibers flowers force gastric juice give glands glass grow heart heat insects inside intestines iron joints kind lamp larvæ larynx leaf learned leaves legumes lever light rays liquid lungs machine magnet material membrane milk motion mouth muscles needle nerve object organs oxygen pass piece pistil plants pole produce protected right auricle rubbed sal ammoniac seeds sepals skin small intestine sound stamens steam stem stomach stomata substance sugar sunlight teeth things trees tubes veins ventricle vibrate walls weight wheat wind wire wonderful wood zinc
Δημοφιλή αποσπάσματα
Σελίδα 513 - Measures of Weight 10 milligrams (mg) =1 centigram eg 10 centigrams =1 decigram dg 10 decigrams =1 gram g 10 grams =1 dekagram Dg 10 dekagrams =1 hektogram Hg 10 hektograms =1 kilogram Kg...
Σελίδα 404 - THIS is the forest primeval. The murmuring pines and the hemlocks, Bearded with moss, and in garments green, indistinct in the twilight, Stand like Druids of old, with voices sad and prophetic, Stand like harpers hoar, with beards that rest on their bosoms...
Σελίδα 513 - Measures of Length 10 millimeters (mm.) . . . . =1 centimeter cm. 10 centimeters =1 decimeter dm: 10 decimeters =1 meter m. 10 meters =1 dekameter Dm. 10 dekameters =1 hektometer Hm. 10 hektometers =1 kilometer Km.
Σελίδα 513 - ... Area. 100 square millimeters (sq. mm.) = 1 sq. centimeter (sq. cm.). 100 square centimeters = 1 sq. decimeter (sq. dm.). 100 square decimeters = 1 sq. meter (sq. m.). 3. Cubic Measure, or Volume. The unit of volume is the liter, which is 1 cu. dm., or 1,000 cc 1,000 cubic millimeters (cu.
Σελίδα 341 - Levers are divided into three classes: in the first class, the fulcrum ' is between the power and the weight ; in the second class, the fulcrum is...
Σελίδα 245 - ... north pole of one magnet will attract the south pole of another, and the south pole of one will attract the north of another ; but the north...
Σελίδα 333 - In the second class of levers th'e fulcrum is at one end and the power at the other, with the weight between them.
Σελίδα 253 - How may it be shown that a, wire carrying a current is surrounded by a magnetic field ? 33.
Σελίδα 330 - ... (1) The lever (2) The pulley (3) The wheel and axle (4) The inclined plane (5) The wedge (6) The screw...
Σελίδα 320 - The shorter the wave length, or, what is the same thing, the greater the number of vibrations in a second, the higher the pitch of a musical note, and vice versa.