Word: stratas
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...great problems to be solved. One of the most difficult of these problems is that of contending against the varying atmospheric conditions, but the modern instruments are so skillfully constructed that photographs of marvelous clearness have been obtained in spite of the varying density and light of the air strata...
...reach the top of his profession a broad education, and a firm grasp of some subject lying outside of his vocation, is a vast advantage; and we must not forget that in substantially confining the professional schools at Harvard to college graduates we are aiming at the higher strata in the professions...
...that man first rose in the air. Only two years after the discovery of the balloon, Dr. Jeffries of Boston made an ascent for a scientific study of the atmosphere, and soon after crossed the English Channel in his balloon. As was found out after these experiments, the upper strata of the air at a distance of more than five or six miles from the earth, were both too cold and too rarefled for human beings. Mechanical contrivances for recording temperature and pressure were therefore devised and sent up in empty balloons. These were made of rubber which steadily expanded...
...Peck, in describing his ride up Pike's Peak at night, spoke of the rugged beauty of this mountain, which is over 14,000 feet high. At the top an unusual view may be had of the deep abysses and chaotic masses of rock strata below...
...conduct an excursion to Woods Hole and Martha's Vineyard, leaving Boston Monday morning at 7.38 o'clock, and returning before the end of the recess. At Woods Hole the state fish hatcheries will be inspected, and on Martha's Vinevard the Gay Head section of mesozoic and tertiary strata, including stream diversions of the interglacial age, will be studied, an opportunity being given to collect fossils and lignites. All men who wish to go on this trip may apply to Mr. Smith...