. Guide leaflet. mpared to their size, for they aregenerally surrounded by hazy or nebulousenvelopes. Meteors, on the other hand,are transient cosmical bodies which enter the earths atmosphere from without andbecome luminous as they shoot across thesky. Meteorites are masses of matterfrom outer space which have fallen uponthe earths surface. They consist usuallyof stony matter with varying amounts ofmetallic iron and nickel; more rarely ofnickeliferous iron and much more rarelyof stony matter with Httle or no metal. For untold centuries man has looked atthe starry canopy of the heavens at nigh
. Guide leaflet. mpared to their size, for they aregenerally surrounded by hazy or nebulousenvelopes. Meteors, on the other hand,are transient cosmical bodies which enter the earths atmosphere from without andbecome luminous as they shoot across thesky. Meteorites are masses of matterfrom outer space which have fallen uponthe earths surface. They consist usuallyof stony matter with varying amounts ofmetallic iron and nickel; more rarely ofnickeliferous iron and much more rarelyof stony matter with Httle or no metal. For untold centuries man has looked atthe starry canopy of the heavens at nightand marveled at the wondrous display ofthe moon, the planets, and the multitudeof stars set in constellations or in the]\Iilky Way. During the day this samecanopy impresses him in a different man-ner, for, due to the strong light from thesun, the zenith appears to be sky-blue anda sense of emptiness and vacancy is inevidence everywhere except for the cloudsthat may form in the lower levels of the NATURAL HISTORY. atmosphere called the troposphere. Thestars and phinets which are prominent onclear nights can seldom be seen in thedaytime except from the depths of a well,a cave, a canon or through a telescope. Man has discovered from such observa-tions spread over many centuries thatthese various celestial objects have regularyearly movements, that they are governedin their course by definite physical laws,and consequently he has grown accus-tomed to their regular movements, for hesets his clocks and watches by siderealtime, predicts the time of eclipses towithin a few seconds of their happening,plants and harvests his crops accordingto the seasons, makes hishome on the earth andplans his business under-takings for the comingyear with full confidencethat these bodies willcontinue their accus-tomed movements andfunctions. On the other hand ithas been more difficultfor man to visualize the OLLAQUE SIDEROLITE,OLLAQUE, BOLIVIA The polished surface shows olivine masses filling meshes o
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
