We called attention to Part ii. of the Fifth volume of the Journal of this Society in our December number. We have just received the first part of the sixth volume, and are glad to find that the subject of Agricultural Geology once more finds a place in its pages, and that the Secretary, Mr. Jenkins, is again its advocate and exponent. In the present part, Mr. Jenkins applies his geological training to an exposition of the surface-geology of Belgium, whither he had gone in the latter part of the summer of 1869 to report on the Agriculture of that kingdom, accompanied by Dr. Augustus Voelcker, the Society's chemist.