Constance, flows forth, colored of a clear green, and this under all circumstances and in all weathers. It is sometimes said that this arises from the torrents which supply these rivers generally flowing from the glaciers, the green and blue color of which may have given rise to this opinion; but the color of the ice is purely optical, as the fragments detached from the mass appear white. Perhaps some correspondent can afford me information on the subject. J. R.[26] _March, 1834._ FOOTNOTES: [Footnote 24: From London's _Magazine of Natural History_ (London, Longmans & Co., 1834), vol. vii., No. 41, pp. 438-9, being its author's earliest contribution to literature.--ED.] [Footnote 25: This lake, however, if the poet have spoken truly, is not very feculent:-- "Lake Leman woos me with its crystal face, The mirror where the stars and mountains view The stillness of their aspect in each trace Its clear depth yields of their far height and hue." BYRON.] [Footnote 26: In the number of the magazine in which this note appeared was an article by "E. L." on the perforation of a leaden pipe by rats, upon which, in a subsequent number (Vol. vii., p. 592), J. R. notes as follows: "E. S. has been, surely, too inattentive to proportions: there is an inconsistency in the dimensions of a leaden pipe about 1-1/4 in. in external diameter, with a bore of about 3/4 in. in diameter; thus leaving a solid circumference of metal varying from 1/2 in. to 3/4 in. in thickness.--_J. R._, _Sept. 1834._"--ED.] FACTS AND CONSIDERATIONS ON THE STRATA OF MONT BLANC, AND ON SOME INSTANCES OF TWISTED STRATA OBSERVABLE IN SWITZERLAND.[27]