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Science Bulletin

A Service Bulletin for Teachers of High School Science.

Human Physiology, H. Earl Rath

Science Bulletin

As a small boy I recall sitting near the front of the room in a rural school with my legs swinging vigorously several inches from the floor, and listening while a large group of older boys and girls attempted to recite the names of the bones of the body as well as many other parts. The class appealed to me principally because it seemed to give great pain to the participants, and because it was still a long way off so far as I was concerned. With much less glee do I recall the time a few years later when …

The Migration Of Birds: Part I, O. R. Clark

Science Bulletin

Among the most characteristic and familiar activities of our birds are their regular seasonal movements between their winter homes and their summer nesting sites.

Question Box

Science Bulletin

Can two violins playing the same pitch simultaneously be heard farther than one?

The Planetesimal Hypothesis, E. J. Cable

Science Bulletin

In a former article the writer called attention to the fact that the La Placian hypothesis has been abandoned by scientists because of the serious astronomical, biological, dynamical, and geological difficulties encountered. The Planetesimal or Accretion hypothesis, which has superseded it, is the gift of Doctor T. C. Chamberlin, formerly head of the Department of Geology at the University of Chicago and Director of the United States Geological Survey.

Smoke Makes City Warmer

Science Bulletin

Mr. Fred L. Disterdick, of the U. S. Weather Bureau at Des Moines, has observed surprisingly great differences in temperature between the smoke covered city and the nearby country.

Editor And Advisory Board

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Universe May Not Be Running Down

Science Bulletin

The Sun by radiation is losing energy at a tremendous rate. The Earth receives about one two thousand millionth part of this, and other planets, satellites and asteroids their tiny share. The rest travels out into the depths of space, presumably to be lost forever so far as the solar system is concerned.

Plant Disease Control, C. W. Lantz

Science Bulletin

In the November issue of the Bulletin some idea of the crop losses due to plant diseases was given. Obviously the farmer should be concerned in preventing these losses if he is to profit most from his labor. The control of plant disease lies in prevention rather than cure. In most cases, the individual plant is not of sufficient value to warrant an attempt to cure it. The exceptions would be in those cases where a valuable individual plant such as a shade tree becomes diseased and it would be desirable to save it.

Science Bulletin, Vol.3 No.5, January 1931 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

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Science Bulletin

A Service Bulletin for Teachers of High School Science.

Question Box, W. H. Kadesch, O. R. Clark, Winfield Scott

Science Bulletin

Question: Wood is opaque to light but is easily penetrated by X rays. The latter, however, are stopped by some kinds of clear glass. Does this not show that light and X rays are of different nature?

Is it desirable to study the theory of evolution in connection with a high school course in Botany? If so, to what extent?

What is the purpose of crop rotation?

On Meeting With A Fox, Roy L. Abbott

Science Bulletin

It is rarely that one sees a wild animal at its best. As a hunter, I have shot many beautiful birds and small mammals, but on retrieving them, in spite of my elation at their capture, I have always had the haunting feeling that the dead thing in my hand was not the creature at which I had aimed. As an anatomist, I have dissected scores of animals, but always do I realize that the stiff, cold thing under my scalpel is not quite the thing it was when alive.

Radio And The Outer Atmosphere

Science Bulletin

In investigating the possibilities of short-wave radio the surprising fact was discovered that although short waves may often be clearly received at distances of thousands of miles from stations with very little power, it is difficult or impossible to detect them at nearby points, 30 to 300 miles away. This can be understood if the upper atmosphere acts like a reflector.

About Atmospheric Electricity, L. Begeman

Science Bulletin

Our atmosphere is electrified at all times. During the summer the average increase of potential from the earth's surface up is about 100 volts for one meter of ascent. This potential gradient, however, diminishes with increasing altitude until at the height of one mile it is only 25 volts per meter. During the winter the atmosphere is much more in tensely electrified. The average increase of electrical potential near the earth 's surface during this season is as much as 250 volts per meter of ascent.

Science Bulletin, Vol.3 No.4, December 1930 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

The Nature Of Adaptations, O. R. Clark

Science Bulletin

In the October number of this bulletin, in a discussion of the influence of environment upon the growth and development of plants, the statement was made that, on the whole, plants are quite well adapted to the conditions under which they grow. As to the manner by which this ''fitness” has arisen there are some differences of opinion and, in the opinion of the writer, a great many misunderstandings. This is a question to which no ''cut-and-dried'' answer can be given but to which a fundamental principle of biology may be applied.

Nobel Prizes For 1930

Science Bulletin

The Nobel prizes in science, each amounting to nearly $50,000, have recently been awarded, as follows.

Editor And Advisory Board

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Fossils Of Three Toed Horse In Wyoming

Science Bulletin

An expedition of the Harvard University Museum of Comparative Zoology, under the leadership of Erich M. Schlaikjer, has recently discovered near Torrington, Wyoming, an enormous fossil deposit in which were found thousands of little three toed horses that lived about 35,000,000 years ago.

Farming In India, Winfield Scott

Science Bulletin

The following extract from an article written by Saint Mhal Singh of India (See Wallace's Farmer, April 30, 1909) is given as a description of farmers in that populous country. The Hindoos are the Eastern Branch of our own Aryan race.

Question Box, E. J. Cable

Science Bulletin

Which hypothesis for the origin of the earth is in best repute?

Can ice become colder than zero degrees centigrade? If not, why?

Will the lack of uniformity in the bore of a mercurial barometer tube affect its reading except for the temperature correction?

Dinosaur Eggs Discovered In Montana

Science Bulletin

Dr. Glenn L. Jepson, of Princeton University, director of an expedition into southern Montana, has reported the discovery of dinosaur eggs in that region.

Experiments In Static Electricity

Science Bulletin

Rub a clean dry glass flask vigorously all over with a piece of silk, and roll it about in a pile of very course cork dust or a quantity of crumbled bits of dry corn stalk pith. When the flask is lifted it will be covered with dust or pith, the particles of which it will proceed to fire off in different directions, some to considerable distance.

What Kind Of Weather For Tomorrow, E. J. Cable

Science Bulletin

One of the most common topics of conversation when friends or strangers meet is "what a fine day," or "what terrible weather.'' No natural phenomena have a more pronounced psychological influence upon man than weather phenomena.

More About Static Electricity, L. Begeman

Science Bulletin

What is the most important property of a charge of electricity?

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Science Bulletin

A Service Bulletin for Teachers of High School Science.

Cosmic Rays As Barometers

Science Bulletin

Prof. R. A. Millikan, discoverer of the Cosmic rays, has recently reported to the National Academy of Science a practical use for those rays. These are the most penetrating radiations known, far exceeding X rays and even the very penetrating gamma rays of radium in that respect.

Science Bulletin, Vol.3 No.3, November 1930 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Plant Disease, C. W. Lantz

Science Bulletin

Many educated people do not realize that a plant may be diseased as truly as a human being; at least they have little conception of the nature and significance of plant disease. In an agricultural state such as Iowa this is an important question and some time can very profitably be given to the study of plant disease either in the biology course or in the agriculture course.