That the superior mentality of the superior student is stimulated to greater effort by recognition so better leadership is developed. That faster pupils are not bored by slowness of low group students, nor slower students so much discouraged when they are segregated; hence all are happier. That tests given high-school seniors do indicate something of the chances of their success in college.
It is suggested: Even though most of the chemistry classes are taught in small high schools it is possible: 1. To administer tests for aptitude in chemistry and determine students of diierent levels of ability and their chances for success in chemistry. 2. To apply the principle of sectioning upon the basis of ability and yet keep them all in one class conference. 3. To give better advice relative to vocational choices and college success by such administration.
Aviators May Carry Liquid Oxygen in Thermos Bottles. Aviators preparing to fly a t high altitudes may now carry their oxygen supply in liquid farm in thermos bottles and thus do away with the transportation of heavy steel cylinders containing the compressed gas. This is the invention of M. Garsaud of the French Academy of Sciences. Not only is it easier to carry oxygen in this way, but larger quantities can be transported in a very small space. The bottles are made of enamelled metal and have two openings at the mouth, one leading the gasified oxygen into the mask worn by the aviator and the other for the passage of a wire carrying an electric current. The electric current heats a tiny quartz lamp inside of the bottle and thus vaporizes the necessary amount of oxygen. The only inconvenience of the apparatus, M. Garsaud says, is splashingof the liquid oxygen in the hottle. This could cause explosion unless corrected by filling it loosely with asbestos. Liquid air can he carried in these bottles for as long as sir days a t a time.-Scicrcc Service Polarized Light Speeds Plant Growth. The latest prescription for anemic geraniums and discouraged ferns is polarized light. According to Dr. David I. Macht, plants exposed to polarized light grow a t a faster rate than those exposed to ordinary light. Dr. Macbt worked with an artscially produced, or "synthetic" polarized light, the commercial application of which would be impracticable. But it is interesting to note that there is in nature a free source of polarized light in the moon. Light reflected a t certain angles is polarized and, since maonlight is simply light reflected from the sun, it is largely polarized. Thus, planting thimgs "in the light of the moon," or "the dark of the moon." may at least possess a germ of scientific truth. Planted in the dark of the moon a seedling will be sprouted in time to get the Light of the next full moon, but if planted in the light of the moon it will not have this advantage.-Science Service
