Original Papers. By the late John Hopkinson, D.Sc. Vol. I.,
"Technical Papers." edited, with a Memoir, by B. Hopkinson. Vol. IL, "Scientific Papers," same Editor. (Cambridge University Press. 10s. ad. per vol.) -The papers in the first volume mostly deal with particular applications of electricity to practical put- poses, or to the general subjea. Electricity and magnetism, Tined from the scientific side, are again the chief topics treated in Vol. II. All this is beyond our province; the editor's memoir of his father is of general interest. Dr. Hopkinson graduated at Cambridge in 1870, coming out as Senior Wrangler (he was first in fourteen out of sixteen papers, and obtained the first Smith's Prize). For a time he had an idea of teaching, and actually applied for a Mathematical Lectureship at Owens College, Manchester. This application he withdrew, and before long definitely gave up his life to practical work. Before he was twenty.three he was appointed engineer and manager of im- portant optical works, taking precedence of men of considerable "Perinea, and soon justifying his appointment. From that time till his premature death by an accident in the Alps he confinued to achieve an uninterrupted success. The picture here drawn of his moral awl mental qualities is of remarkable
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