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Articles 33031 - 33060 of 35956
Full-Text Articles in Entire DC Network
Molecular Forces, L. Begeman
Molecular Forces, L. Begeman
Science Bulletin
The three states of matter denoted as solids, liquids and gases are different phenomena of matter arising from a change in the intensity of molecular attractions.
New-Type Tests In Agriculture, Winfield Scott
New-Type Tests In Agriculture, Winfield Scott
Science Bulletin
Modern methods of testing a pupil's knowledge have been applied successfully in the teaching of agriculture. The writer submits a few sample question sets as illustrative material.
Collecting Specimens At Night, Roy L. Abbott
Collecting Specimens At Night, Roy L. Abbott
Science Bulletin
Many teachers of biology don’t realize how much valuable biological material may be collected after dark. In fact, certain specimens, as grasshoppers, earthworms, and various species of amphibia, are most easily captured then.
Crystallization, L. Begeman
Crystallization, L. Begeman
Science Bulletin
One of the most interesting molecular phenomena in nature is known as crystallization. It is brought about in the arts of man and in nature by three methods. When a chemical salt, such as table salt, is dissolved in water and allowed to stand in a shallow dish until it dries, it will be observed that the solid residue appears as crystals. Those from common table salt will be cubical in form. However, every different salt will yield its own distinctly shaped crystal.
Editorial
Science Bulletin
Nothing will more largely contribute to the teacher's peace of mind or to the pupils' efficiency than proper foresight for the fall. A two or three day incarceration in your empty and silent laboratory and classroom some time between the closing and reopening of school should represent a good investment. During this voluntary exile, put to yourself a few questions and motorize the answers.
Capillarity, L. Begeman
Capillarity, L. Begeman
Science Bulletin
One of the best practical illustrations of the effect of surface tension is found in capillarity. For this topic the instructor will do well to base his teaching upon surface tension. It is this force that raises the water in a clean glass capillary tube and that depresses the mercury in such a tube.
The Purple Pen, Volume 1, Number 1, May 1929 [Download Entire Issue]
The Purple Pen, Volume 1, Number 1, May 1929 [Download Entire Issue]
Purple Pen
No abstract provided.
The Charm Of Kentucky, Helen Brown
A Red-Winged Blackbird, C. P.
Front Matter - Table Of Contents
The Value Of Value, Corley Conlon
My Ford And I, Calvin Schnucker
The Village Editor, Zella O'Neal
My Garden, Dorothy Hansen
The Airplane, Alice Lockard
The Skagen Tide, Ethel Christensen
Sid, Robert Ebel
Wheat Fields, Evangeline Comstock
A Toast, Irene Freeman
A Maple In Autumn, S. A. Lynch
The Old Order Changeth, G. Berryhill
Black Magic, Dorothy Humiston
Sea Gulls, Alice Lockard
Mother, C. Esther Copp
Poem, Ralph Childs
Loveliness, Margaret Claud
The Fake Nature Lover, Florentine Martin
Pollyanna, Marjorie Brunswold
For Margaret, Harryette Creasy