I feel also that some apology is due for the number and the length of the notes. As I have just stated, the nature of the subject required frequent reference to disputed topics. To have met the current objections to the principles which I assumed by stopping on each occasion to discuss them in the test, would have inconveniently broken the sequence of ideas, and hopelessly weakened the force of the general argument. On the other hand, to have wholly passed them by without notice would, perhaps, have been still more unsatisfactory to those who were disposed to adopt such objections. I should thus have been guilty of the imprudence of a commander who invades a country leaving numerous untaken fortresses in his rear. Under these circumstances I have had recourse to the only other alternative—that of transferring such discussions to the notes, or, where the argument is too long for a note, to an appendix.
J. E. CAIRNES.