Side-Lights on
章节目录
共 23 段- I have already spoken of the heat of the sun and its probabl
- The mysterious emanations from various substances, under cer
- If, as was formerly supposed, the stars did not greatly diff
- The doctrine of cosmic evolution--the theory which in former
- The parallaxes of which we have heretofore spoken consist in
- So far as we have yet described our telescope it is opticall
- Another object of the same class is Proesepe in the constell
- A fact which will appeal to our readers on this side of the
- You ask me how the planets are weighed? I reply, on the same
- When the most exact observations on the direction of the nee
- The claims of scientific research on the public were never m
- In pursuing our theme the question next arises as to the spe
- About the middle of the last century the lunar tables were s
- The problem as thus presented was one of the most difficult
- For centuries astronomers made the most exact observations t
- Having gained this point of view, our next inquiry will be i
- The feature of this period which has the closest relation to
- Closely connected with the problem of the extent of the univ
- In 1837 a city charter was obtained from the legislature of
- We can have no more hopeful answer to these questions than t
- Among those subjects which are not always correctly apprehen
- Perhaps the most injurious effect in this direction arises f
- Dr. Graham Bell, with a cheery optimism very pleasant to con