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By William T. Skilling; Robert S. Richardson

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It be since by from the way in source information is derived chief of "he which earthquake w'aves travel through the globe. Two types of waves. Waves passing through an elastic body (one that quickly recovers its original shape if not strained beyond a certain limit) are of two types, called by seismologists P and S waves. The P, or primary, waves are so called because they are the first to register on a seismogram after an earthquake. The P waves are akin to sound waves in that they are transmitted by alternate compression and rarefaction of the material in the of the interior of necessity I same direction that the 1 he S, or wave itself is traveling.

Are in the evening sky from about October to April. An interesting spring and early summer star many cluster is remind one of a swarm of bees. It is in the constellation Cancer, and is almost exactly on the ecliptic, the path described by the sun, and closely followed by the moon and the planets. This group is more difficult to find for, being very distant, its stars are Praesepe, well called the "Beehive," as its stars dim. Globular clusters, as distinguished from open clusters, are well represented by "the great globular cluster in Hercules" (Fig.

Measurement of Eratosthenes. C. He was told that on June 22 the sun at noon illuminated the bottom of a well at Syene, which meant that the sun was precisely overhead at that time. On June 22 he measured the slant of the sun's rays at noon at Alexandria as l^o of a circle. " Hence, the circumference of the earth was found to be 50 X 5000 = 250,000 stadia. There were several kinds of stadia used at that time, and the length of the one used by Eratosthenes has been the subject of much discussion.

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