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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.