352 Methods of Stratigraphy. — Winchell. 
Science. There is no doubt that that "Huronian" which Dr 
Bell all the time alludes to is conformable on the crystalline 
schists and the crystalline schists on the Laurentian, a fact 
which has been published repeatedly by officers of the Cana- 
dian survey and in the reports of the Minnesota survey. 
3. It is not just to the founder of the Huronian system to 
restrict the term to the type Huronian. Here we must differ 
squarely from Dr. Bell. It would be unjust not only to all 
subsequent investigators, but more so to the authors of the 
term, not to do so. If we are not to accept an author's defini- 
tion of his own discovery, who shall set metes and bounds to 
it? Again, Dr. Bell in several instances, insists on adhering to 
Logan's descriptions, "which" as he says, "are as clear as lan- 
guage can make them." 
4. The comparatively undisturled conditiori seeri in the 
Huronian on lake Huron is not the rule in the '^ Huronian'''^ 
elsewhere. But by the term "Huronian" here Dr. Bell indi- 
cates the strata which are in dispute, and which we admit are 
much more crumpled — a circumstance which, with other dif- 
ferences, has led to their separation from the true Huronian. 
And when Dr. Bell states that "the same rocks" are highly 
crumpled and tilted in other districts, we respectfully ask for 
proof that they are the same that Logan included in his orig- 
inal descriptions. 
5. '■^ As a m.atter of fact crystalline schists, such as those 
that prevail among the Huronian rocks of lake Superior are 
largely associated with the quartzytes and slate-conglomer- 
ates of the lake Huron region.'" We would respectfully ask that 
they be pointed out. Not only has Logan given a typical sec- 
tion, without including them, but Prof Irving failed to find 
them, and later still, my brother and myself made a pretty 
thorougli examination without seeing them. We venture to 
suggest that (as I know from observations made the past sum- 
mer) the crystalline schists exist only outside of the region 
described and mapped in the Geology of Canada, 1863, begin- 
•ing, on the east, not far from Serpent river, and extending 
thence eastward to the recognized Laurentian. This is doubt 
less what Dr. Bell would consider "associated largely with 
the quartzytes and slate- conglomerates," but it is the same 
kind of association that might be applied to the Laurentian 
gneiss which occupies the lake shore for some miles between 
