966 General Notes. [September, 
of mention. Masses of sandstone of tons weight are not “sandy 
beds.” 
The remark as to the serpentine belt swinging around towards 
Chester I did not attribute to Mr. Hall. I was criticizing no in- 
dividual. I was simply pointing out what my observation con- 
vinced me were conspicuous errors in Vol. C 6 of the Geological 
Survey. 
If on page 525 it is intended to convey the impression that! 
was guilty of plagiarism, or at least of failure to give due credit — 
to Dr. Frazer, I would offer as my apology the fact that my arti- 
cle was read December 23, 1881, and published in April, 1882, 
while his was read A. P. S. Dec. 15, 1882, eight months later. — 
The statement, page 528, that C 6 did not appear until late in 
1882 is certainly erroneous. It bears the imprint 1881, and was — 
in our libraries in December, 1881, hence the inference deduced, — 
that the imprint on the Proceedings of the Section is an erroris — 
likewise a mistake. a 
Dr. Frazer says: “The map is quite obscure, and it Is difficult 
to ascertain whether the section given lies in Chester or Delaware 
county.” eB 
The map is distinctly stated upon its face to be of Lower Mer- . 
ton and vicinity. The township lines between Lower Me n 
Radnor, and Upper Merion townships and Chester county nee | 
distinctly given and named upon the map. It was presum : a 
those interested in the subject were aware in what counties those 3 
townships were. The section line is clearly delineated as passing 
through Radnor township into Lower Merion. E 
I regret exceedingly if I have ignored the work of any one u 
this field, and if I have, I have sinned through ignorance of : 
through supposing that in C 6 was to be found the knowledge 0t 
the region up to the date of its publication. _ : a 
In natural science the first thing to obtain is facts, ana 1n sa 
gion as geologically obscure as that south of the cac pane 
every fact in regard to the rocks should be welcomed y neth 
one desiring scientific truth rather than to sustain thenni g es 
such facts be ascertained by the members of the Geolog mined 
or by an obscure individual. Let the facts be Ot baie 
$ ected, js 
into them and who does not seem to have read the pap® i 
which they are set forth. | ae 
Two observers go over the same ground. Loe snot the 
“every outcrop at least once,” and publishes a map the work 
other, while not pretending to have done su ho ee 
describes many serpentine outcrops which the ae pe 
finds mica schists in two places where the first found SE 
Now it is very easy for a third, who has not exam! tek G 
crops, to suggest that the only explanation 1s that wat = 
