Although this theory of a "sufficient price" is the chief topic of Mr Wakefield's book, yet there are many other subjects of interest discussed, and many valuable suggestions thrown out in it; and if we have felt ourselves compelled to enter our protest against his main theory, we are by no means unwilling to confess our share of obligation to one who has made colonisation the subject of so much study, and who has called to it the attention of so many others. It was he who, struck with the gross error that had been committed of stocking certain of our colonies with too large a proportion of the male sex, first pointed out that the period of marriage was the most appropriate period for emigration. Do not wait till want drives out the half-famished children, but let the young married couple start whilst yet healthy and vigorous, and not broken down by poverty. Some might be disposed to object that these will do well enough in England. They might, but their children might not. It is wise to take the stream of population a little higher up, where it yet runs clear; not to wait till the waters have become sluggish and polluted. In a literary point of view, Mr Wakefield's book is an extremely entertaining one. It is difficult to believe what we are told in the preface, and hear with regret, that it was written in ill health, so elastic a spirit is observable throughout. The work assumes the form of letters passing between a statesman, who is in search of information and theory on the subject of colonisation, and a colonist who has both to give. One would naturally conclude, from the letters themselves, that both sets were written by the same author, and that the correspondence was but one of those well-understood literary artifices by which the exposition of certain truths or opinions is rendered more clear or interesting. The letters of the statesman have that constrained fictitious aspect which responses framed merely for the carrying on of the discussion are almost sure to acquire. At all events, it was hardly necessary for Mr Wakefield to describe himself in the title-page as "_one_ of the writers;" since the part of the statesman, in the correspondence, is merely to ask questions at the proper time, to put an objection just where it ought to be answered, and give other the like promptings to the colonist.