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this chapter I shall endeavor to give such explanations as will enable the general reader to follow the course of discovery in each branch of astronomy and physics, regularly through the period of life, and up to the state in which he left it.

A more detailed and precise account, which should appeal directly to the professional astronomer, will not be needed, since has already fulfilled this want in his "Analyse de la vie et des travaux de Sir ," published in 1842. The few misconceptions there contained will be easily corrected by those to whom alone they are of consequence. The latter class of