We possess only a few elements of the Insects of the Coal Period—Articulata are rare in these beds, and it is only after long research that we are able to collect sufficient materials for a special work on the Entomology of this epoch.

The materials for a classification of the later Pleistocene deposits of Cornwall are so voluminous that it was found impossible to embody them in a single paper. Having submitted to the Geological Society a general classification with such notices of the deposits as seemed necessary to show the grounds whereon it was based, I purpose in the following paper to complete the notices of deposits. As an apology for the amount of compilation thus rendered necessary, I must plead the object of the papers, viz. to place in one view all that has been written on the subject, as references alone would entail more time and trouble in looking up than many readers would be disposed to concede.

As the Carboniferous rocks form a framework around the Silurian mountain country, so do the Permian rocks for considerable distances lie as an outer flat and bevelled edge to the slightly raised Carboniferous frame, the edge indeed overlapping the frame itself along the west coast-line between St. Bee's Head and the Duddon Estuary.

In last month's Geological Magazine there is much (by three writers) that bears upon the Devonian Question, and I would now add a few words on the same subject, which is of the greatest interest to me.

In the Geological Magazine for February will be found a “Note in Press,” appended by Mr. Kinahan to his paper on the “ Silurian Rocks of Ireland,” read some time ago before the Royal Geological Society of Ireland, and which I had an opportunity of hearing and replying to. On that occasion I pointed out some of the numerous defects and erroneous views which this paper contains; and could have wished that the matter had rested here, because I consider it highly unbecoming that the Director of the Survey should enter into a public controversy with one of his staff on points connected with the geological structure of the country which has been entrusted to him for elucidation. on the english and scotch surveys such conduct is happily unknown, and however the field surveyors may differ amongst themselves, and maintain their opinions in print, there has always existed a sufficient feeling of respect for the heads of the survey, as well as a just consideration of the interest and credit of the survey itself, to prevent open controversies with the heads of the survey in the public prints the solitary exception. I cannot take blame to myself for having provoked the “Note in press” to which I have referred, because there is nothing in my paper, published in the Geological Magazine, Decade II. vol. v. 1878, p. 529, to call forth the statement on the part of Mr. Kinahan that I had made “various errors in reference to the Irish rocks.”

Errata and Omissions.—In Mr. Lapworth's paper on the Tripartite Classification of the Lower Palæozoic Rocks, Geol. Mag., January, 1879.

After title insert—(Read before Edinburgh Geological Society, Dec. 19, 1878.)

p. 3, line 1, for light read right.

p. 3, line 40, for division read divisions.

p. 12, line 20, for it read them.