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Preface to the First Edition.
xi
I cannot conclude these prefatory remarks without acknowledging the kind assistance which I have derived from those who have verified ray statistical facts; but I have especially to thank my friend, Mr. Leslie Stephen, Fellow of Trinity Hall. He has given me many most important suggestions, and has carefully revised the work: the accurate and complete knowledge which he possesses of the science makes his revision peculiarly valuable.
The labour of writing these pages would have been much greater, if I had not been fortunate enough to have a most patient and excellent amanuensis in the youth who is to me so faithful an attendant.
Trinity Hall, Cambridge,
Feb, 1863
