12. What is the etymology of "thermometer"?
13. Illustrate the meaning of "chronometer" by using it in a sentence.
14. What adjective is formed from "diameter"? Ans. Diametrical—What adverb is formed from "diametrical"?—What is meant by the expression "diametrically opposed"?
15. What science was the forerunner of astronomy? Ans. Astrology—Give the derivative of this word.—What word denotes one who is skilled in astronomy?—Form an adjective from "astronomy."—Compose a sentence containing the word "astronomy." MODEL: "The three great founders of astronomy are Copernicus, Kepler, and Newton."
16. From what root is "telescope" derived?—Combine and define telescop + ic.—Compose a sentence using the word "telescope."
17. From what root is "microscope" derived?—Combine and define microscop + ic.—What single word denotes microscopic animals? Ans. Animalculæ.—Compose a sentence containing the word "microscope." MODEL: "As the telescope reveals the infinitely distant, so the microscope reveals the infinitely little."
18. Compose a sentence containing the word "antipathy." MODEL: "That we sometimes have antipathies which we cannot explain is well illustrated in the lines:
'The reason why I cannot tell,
I do not like you, Dr. Fell.'"
19. What adjective is formed from "apathy"?