CHAPTER I

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THE SELECTION AND TESTING OF A GLASS 1

How to get a good telescope--Difference between reflectors and refractors--How a telescope is made achromatic--The way to test a telescope on stars.

## CHAPTER II IN THE STARRY HEAVENS 19

Orion and its wonders, Lepus, Canis Major, Argo, Monoceros, Canis Minor, and the Head of Hydra.

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