310 The American Geologist. May, 1895 
Series 41. Terrace Bay. Terrace at 96. 3 feet. 
Series 4^. Jackfinh Baif. Terraces at 110.1. 102.9, and 84.9 feet. The 
one at 102.9 feet i.s do.scribed as beiiifj; i)rominent and comes closest to 
the expected place of the Nipissin^' bcacli. 
Series 43. Three miles east of Jackfinh. Tlie railroad follows a terrace 
which has a maximum hight of 111 feet. "Hut the precise rear of the 
terrace is not susceptible of exact determination, and this figure (111 
feet) was considered in the field several feet too high for what is proba- 
bly the true rear of the terrace." This seems to bring this terrace into 
substantial coincidence with the 102.9 feet terrace at the previous lo- 
cality. These two are the farthest of Lawson's series towards the 
north-northeast, which is the direction of maximum rise of the Nipis- 
sing plane. 
Series 44. Dog River. Terrace at 100.7 feet. This seems a little high, 
but may be of Nipissing age. 
Series 45. Sand River. Terrace at 75.2 feet. 
Series 46. Montreal River. Terraces at 78.7 and 61.9 feet. 
Series 47. Mamainse. No report at low levels. 
Series 4S. Sault Ste. Marie. Nipissing beach leveled by Lawson at 49 
feet and observed by the writer also on both sides of the river. 
Summary and Conclusions. 
The rate of rise of the Nipissing plane northeastward from 
Sault Ste. Marie as measured between there and North Bay, 
Ontario, is a little higher than from Petoskey to the former 
place. Carrying this more inclined plane northwestward 
across the northern part of lake Superior in the direction in- 
dicated by the trend of the isobases on the map with the 
paper on the second lake Algonquin, one is led to expect the 
Nipissing beach on the extreme north Superior shore at higher 
altitudes than would be indicated by the production of the 
plane from its less inclined part on the south shore. The 
strand which, from Prof. Lawson's description, seems most to 
resemble the Nipissing beach at the few and scattered places 
of observation in the extreme north indicates that the Nipis- 
sing beach falls somewhat below its expected place as com- 
pared with the extended plane of its more highly inclined 
part. Its altitude in the north appears to be a trifle over 100 
feet above lake Superior; whereas, on the Sault Ste. Marie 
and North Bay plane it should be about 120 to 130 feet. On 
the south shore plane produced it would be at about 100 feet, 
and hence it lies more nearly in the latter plane. It appears, 
therefore, that the hypothetical isobase EE, as shown in the 
map with the article on the second lake Algonquin, does not 
