/o The American Geologist. August, 1902. 
very clear. They have grown in the rock like a potato in 
a hill expelling the material of the enclosing rock from the 
place they have come to occupy. They are unstrained and 
so have grown under a minimum of pressure. The rocks are 
strongly folded, and in and by the process of folding the 
given bed may be in part relieved from pressure and the 
remaining pressure made equal from all directions. We can 
in-'itate this with a thick pile of paper. If it be folded with both 
ends held firmly there will often be places where the leaves 
\y\\\ warp apart from each other. And if something like this 
v.'cre effected where there was a sandy layer between two 
more rigid layers, portions of the sandy layer might have 
the pressure thus equalized. And by this equalized pressure 
the crystal was allowed to grow equally in all directions but 
prevented from forming crystal faces. 
It is curious that the entire metamorphosis of the amphib- 
olyte and the filling of the amygdules each with a central 
group of coarse hornblende needles in a granular plagioclase 
should take place without changing the place of the amyg- 
dules in the slightest and that the micarchist should be 
formed and permit the growth of the large adularias with- 
out pressure and without changing the lamination of the rock, 
and perhaps without disturbing what seems to be a distinct 
ripple-marking. 
THE NEW MADRID EARTHQUAKE 
[Compiled from various sources] 
By Garland C. Broadhhad, Columbia, Mo. 
At the time of the Charleston earthquake in 1886 the 
country was thickly settled for 500 miles in every direction 
and the land and its manifestations were closely observed and 
inieliigently recorded. 
The New Madrid earthquake of 181 1 and 1812 occurred 
at a time when there were few settlements near, and but few 
persons made records of the phenomena. But it was felt as 
far south as Mcksburgh, Miss., and Louisville, Ky., and at 
other distant places. 
Lorenzo Dow, the celebrated evangelist, visited Xew Ma- 
drid in 181 5, and observed the efifects of the earthquake. At 
his request Eliza Bryan, of Xew Madrid, wrote to him on 
