'Volcanic Islands.' Summer of 1842 to January, 1844. 'Geology of South America.' July, 1844, to April, 1845. Second Edition of 'The Journal,' October, 1845, to October, 1846. The time between October, 1846, and October, 1854, was practically given up to working at the Cirripedia (Barnacles); the results were published in two volumes by the Ray Society in 1851 and 1854. His volumes on the Fossil Cirripedes were published by the Palaeontographical Society in 1851 and 1854. Some account of these volumes will be given later. The minor works may be placed together, independently of subject matter. "Observations on the Structure, etc., of the genus Sagitta," Ann. Nat. Hist. xiii., 1844, pages 1-6. "Brief descriptions of several Terrestrial Planariae, etc.," Ann. Nat. Hist. xiv., 1844, pages 241-251. "An Account of the Fine Dust (A sentence occurs in this paper of interest, as showing that the author was alive to the importance of all means of distribution:-- "The fact that particles of this size have been brought at least 330 miles from the land is interesting as bearing on the distribution of Cryptogamic plants.") which often Falls on Vessels in the Atlantic Ocean," Geol. Soc. Journ. ii., 1846, pages 26-30. "On the Geology of the Falkland Islands," Geol. Soc. Journ. ii., 1846, pages 267-274. "On the Transportal of Erratic Boulders, etc.," Geol. Soc. Journ. iv., 1848, pages 315-323. (An extract from a letter to Lyell, 1847, is of interest in connection with this essay:--"Would you be so good (if you know it) as to put Maclaren's address on the enclosed letter and post it. It is chiefly to enquire in what paper he has described the Boulders on Arthur's Seat. Mr. D. Milne in the last Edinburgh 'New Phil. Journal' [1847], has a long paper on it. He says: 'Some glacialists have ventured to explain the transportation of boulders even in the situation of those now referred to, by imagining that they were transported on ice floes,' etc. He treats this view, and the scratching of rocks by icebergs, as almost absurd...he has finally stirred me up so, that (without you would answer him) I think I will send a paper in opposition to the same Journal. I can thus introduce some old remarks of mine, and some new, and will insist on your capital observations in N. America. It is a bore to stop one's work, but he has made me quite wroth.") The article "Geology," in the Admiralty Manual of Scientific Enquiry (1849), pages 156-195. This was written in the spring of 1848. "On British Fossil Lepadidae," 'Geol. Soc. Journ.' vi., 1850, pages 439-440. "Analogy of the structure of some Volcanic Rocks with that of Glaciers," 'Edin. Roy. Soc. Proc.' ii., 1851, pages 17-18. Professor Geikie has been so good as to give me (in a letter dated November 1885) his impressions of my father's article in the 'Admiralty Manual.' He mentions the following points as characteristic of the work:--