120 The American Geologist. February, 1895^ 
lower beaches of that coast. But the methods wliich he used 
prevented the discovery of such deformation as may exist. 
By the projection of its plane from the south shore the Nipis- 
sing beach should be expected on the extreme northern shore 
at an altitude; of 100 or 110 feet. 
'iTo be coiu-ludcd.] 
EDITORIAL COMMENT. 
An Amusing Erkok. 
Our able and esteemed contemporary, Nature, has fallen 
into a rather amusing error in quoting an illustration from 
the first volume of the reports of the geological survey of Iowa. 
Prof. Calvin, in an illustration opposite p. 61, has represented 
the overhanging limestone at " the Cascade," Burlington, in 
winter. The cascade is frozen and the ice hangs from the 
edge as long stalactites with a mass of stalagmitic ice at the 
bottom. Perhaps from want of familiarity with so wintry a 
scene the writer in Nature has mistaken the ice for the lime- 
stone and adds words to that effect. Prof. Calvin says, "The 
limestone often stands out in overhanging clilTs over the 
pofter Kinderhook beds," but in Nature we read, "The lime- 
stone often stands out in overhanging cliffs over the softer 
shale beds beneath and gives the appearance of a cascade, as 
shown in the accompanying illustration, which is reduced 
from a plate in the report." 
Regarding the report itself our contemporary adds the fol- 
lowing remarks, which from such a source are highly compli- 
mentary : 
"The volume referred to in the foregoing note showed us 
that the publications of the Iowa survej^ were to be of a high 
character. The second volume goes to confirm this view. It 
is a description of the coal deposits of Iowa, by Dr. C. K. 
Keyes, and is a model of what such a report should be. With 
text running into more than 500 quarto pages, 18 full page 
plates of a high quality, representing interesting formations, 
in connection with the Coal Measures, and over 200 figures in 
the text, the volume is an attractive handbook for the coal 
