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He has served Harvard College, as University lecturer on philosophy, 1869-71, in 1870 as instructor in history, and from 1872 to 1879 as assistant librarian. Since resigning from that office he has been for two terms of six years each a member of the board of overseers. In 1881 he began lecturing annually at Washington University, St.
From Father Secchi's and Professor Respighi's observations, 1869-71, were derived the first clear ideas on the subject, which have been supplemented and modified by the later researches of Professors Tacchini and Riccò at Rome and Palermo. The results are somewhat complicated, but may be stated broadly as follows.
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