The present work has i lled much of our time and thoughts for some years. We send it forth, however, well knowing that in many parts of our i eld we have accomplished, at most, a preliminary exploration. Oftentimes our business has been rather to quarry and hew for some builder of the future than to leave a i nished building. But we have endeavoured to make sure, so far as our will and power can go, that when his day comes he shall have facts and not i ctions to build with. How near we.