15 JUNE 1867, Page 23

A Discourse on Continuity. By W. R. Grove, QC., F.R.S.

Second Edition. (Longmans.)—It is with much pleasure that we notice the- second edition of Mr. Grove's "Nottingham Address." The theory ad- vanced in it has been so fully discussed and so recently, that we need not open the debate anew ; and the occasion of an annual survey of the workings of science is not the most suited to the development of a fun- damental principle. But it is always well that a survey should have some connecting link, should suggest something beyond what it chroni- cles, and should show that continuity does not mean progress in the- same path, but the conquest of new fields by means of those which have- been won already.