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vi any scientific points which were not clear to the short-hand writer; hence all that is different arises solely from the impossibility, alas! of conveying the manner as well as the matter of the Lecturer.

The interest which was felt in those numbers of the in which the lectures appeared was so great that the republication of them in a separate form was considered to be almost a duty to those young lovers of science to whom a purely chemical journal with its inevitable technicalities would be a sealed book. May the readers of these lectures derive one tenth of the pleasure and instruction from their perusal which they gave to those who had the happiness of hearing them!

W.C.