112 ANSWERS TO PRACTICAL QUESTIONS 



manganese, magnesium, tin, copper, and carbon. This alloy has 

 not been found among terrestrial minerals. 



" 2. The meteoric stones proper are composed of minerals 

 of volcanic origin, and such as are found abundantly in terres- 

 trial lavas and trap-rocks, viz. : 



Magnetic iron, Olivine, 



Sphene, Anorthite, 



Chrome iron, Labradorite, 



Apatite (?), Augite, 



together with a varying proportion of the meteoric iron-nickel 

 alloy." Haughton's Astronomy. 



8. When do ive see the old moon in the ivest after sun- 

 rise ? 



(See Astronomy, p. 127.) 



.9. When do we see the moon high in the eastern sky in 

 the afternoon before the sun sets ? 



(See Astronomy, p. 127.) 



During the second quarter, before she comes into opposition. 



10. When is a planet morning, and when evening, 



star ? 



(See Astronomy, pp. 65, 70.) 



11. Is the sun really hotter in summer than in ^vinter ? 



(See Astronomy, p. 101.) 



12. IVliy is a planet invisible at conjunction ? 



(See Astronomy, p. 65.) 



13. Must an inferior planet always be in the same part 

 of the sUy as the sun ? A superior planet ? 



(See Astronomy, pp. 64 and 67.) 



14. IVJty, in summer, does the sun, at rising and at set- 

 ting, shine on the north side of certain houses ? 



Since at the summer solstice the sun rises and sets north of 

 the E. and "W. points, it will rise and set on the north side of 

 a house which stands exactly N. and S. At the winter solstice 

 the sun rises and sets S. of the E. and W. points. 



15. Wliat effect does the volume of a planet have upon 

 the force of gravity at its surface ? 



(See Astronomy, pp. 40, 80.) 



