An interesting additional example is furnished by the Still River which in Connecticut is tributary to the Farmington, and is no less remarkable for its abnormal northerly course and sluggish current perpetuated in its name, than for the way in which it is joined to the Farmington system (Fig. 367 _A_). A careful study of the district has shown that the Still River was once a part of the Naugatuck and flowed southward toward Long Island Sound like other rivers of the district (Fig. 367 _B_). It possessed, however, an advantage in a narrow belt of softer rock along its course, and because of this advantage it captured a portion of one of the tributaries to the Farmington (Fig. 367 _C_). The continental glacier later covered the region, and on its retreat laid down morainal obstructions directly across this river and also at the head of the severed arm of the Farmington tributary (Fig. 367 _D_). The now impounded waters found their lowest outlet near Sandy Brook, and in waterfalls and cascades the now reversed river falls one hundred feet to the bed of that stream. With the aid of the excellent topographic maps which are now supplied by a generous government at a merely nominal price, such bits of recent history may be read at many places within the glaciated region. [Illustration: FIG. 367.—Diagrams to illustrate the episodes in the recent history of the Still River tributary to the Farmington in Connecticut. _A_, present drainage; _B_, early stage; _C_, after capture of a tributary to the Farmington; _D_, after blocking by morainal obstructions of the ice age.] =Glacial Lake Ojibway in the Hudson Bay drainage basin.=—When by passing over the “height of land” in northern Ontario the greatly reduced continental glacier had vacated the basin of St. Lawrence drainage, it was in a position to impound those waters which normally drained to Hudson Bay. The lake which then came into existence has been called Lake Ojibway and was the latest of the entire series. Though of but recent discovery in a country till lately a trackless wilderness, its extension seems to have been that of the clay beds suited for farming. The beaches and outlets remain to be mapped when the country has been made more easily accessible. READING REFERENCES FOR CHAPTER XXIII Parallel roads of Glen Roy:— CHARLES DARWIN. Observations on the Parallel Roads of Glen Roy and of Other Parts of Lochaber in Scotland, with an attempt to prove that they are of Marine Origin, Phil. Trans., vol. 8, 1839, pp. 39-82. LOUIS AGASSIZ. Geological Sketches, Boston, 1876, vol. 2, pp. 32-76. T. T. JAMIESON. On the Parallel Roads of Glen Roy and their Place in the History of the Glacial Period, Quart. Jour. Geol. Soc. Lond., vol. 19, 1863, pp. 235-259. Glacial Lake Agassiz:— WARREN UPHAM. The Glacial Lake Agassiz. Mon. 25, U. S. Geol. Surv., pp. 658, pls. 38. F. W. SARDESON. Beginning and Recession of St. Anthony’s Falls, Bull. Geol. Soc. Am., vol. 19, 1908, pp. 29-36.