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iv.

as to escape the earth's attraction. 

In conclusion, it is believed that not only has a new and valuable method of reaching high altitude been shown to be [[underlined]] operative in theory [[/underlined]], but that the experiments herein described [[underlined]] settle all the points upon which there could be reasonable doubt [[/underlined]].
[[line]]

The following discussion is divided into three parts:

Part I, Theory,

Part II, Experiments, and

Part III, Calculations, based upon the theory and the experimental results.