27.(Pg. [202]) How does the solar microscope, ([fig. 1 plate 23.]) operate?
28.(Pg. [202]) Why may minute objects be greatly magnified by this instrument?
29.(Pg. [202]) In its more perfect form it has other appendages, as seen in [fig. 2], what are they? and what their uses?
30.(Pg. [203]) What is added when opaque objects are to be viewed? [fig. 3.]
31.(Pg. [203]) In what does the magic lanthorn differ from the solar microscope?
32.(Pg. [203]) What are the use and structure of the telescope, as shown in [fig. 4]?
33.(Pg. [204]) When terrestrial objects are to be viewed, why are two additional lenses employed?
34.(Pg. [204]) What part of the telescope performs the part of a microscope?
35.(Pg. [204]) In what does the reflecting, differ from the refracting telescope?
36.(Pg. [204]) What advantages, do reflecting, possess over refracting telescopes?