The mean-canal cartouches show synthetically, and all the more conclusively for being composite, the laws of the flux of the canals. Something more of vividness, however, is imparted by the actual look of one of the constituents during the process. It is the difference between seeing a composite picture made from a given group of men and the gazing on the actual features of any one of them. So much is gained by the drawings across the page of the Brontes at different stages of its evolution during the period here concerned. But in another way, too, the one canal may be made to yield a more lifelike representation of the process than a number taken together are capable of affording. In the mean-canal cartouches each canal is treated as an entity; but it is possible to consider a canal by parts, and by so doing to see it in action, as it were. It occurred to me to treat the Brontes in this way. For this purpose I divided the canal into sections, five of them in all, between the point where it left the Propontis, at a spot called the Propropontis, to where it ended in the Sinus Titanum. The first, the most northern, extended as far as Semnon Lucus, the southernmost outpost of the Propontis congeries of spots. The second continued on from these to Eleon, the junction where the Erebus crossed. The third thence to Utopia, where the canal met the Orcus; the fourth to an arbitrary point in latitude 8° south, and the fifth and last to the Sinus Titanum. The lengths of these sections were respectively: 12°, 16°, 15°, 12°, and 13°. Each of the sections was then treated as if it were a separate canal and its cartouche found. To the cartouches’ determination there were available drawings: January 21-25 12 drawings. February 23-March 2 15 drawings. March 28-April 5 14 drawings. April 26-May 8 27 drawings. June 3-16 6 drawings. July 11-21 16 drawings. ------------------- 90 drawings in all. The cartouches are given in the plate opposite, which is constructed precisely like the one for the mean canal cartouches presented on page 298. The mid-latitude of the section and its mid-longitude are given in the margin with its description. [Illustration: BRONTES Showing Successive Development South _January to July, 1903_ P.L.] Examining them now we note a family resemblance between the successive cartouches. All sink slowly on the left to rise sharply from their lowest point to the right. Such resemblance betokens the action of one and the same cause. Next, although the curves are resemblant, each has been, as it were, sheered to the right as one reads down; that is, the action took place later and later as the latitude was north.