i a Na El a ge) 
Botany and Zoology. 69 
seam being the Nelsonville, or “ Great Vein,” which a two e 
three hundred feet above the base of the Coal-measu 
roof is a bluish gray shale containing the usual Carbonitenia 
t seems improbable that this bowlder was brought into the 
ancient marsh when the material for the lower seven feet of coal 
had accumulated, and was then covered with the several feet of 
eastern ‘Ohio and Kentu cky. It is the most reliable and persistent 
coal of the lower productive measures. This implies that the 
inate in which it accumulated was very widespread, and that it 
long retained its character as an area of sluggishly ita oF 
sank beneath a shallow sea, muddy with the sediment which is 
now hardened into the roof shales. Bont mes during this sub- 
mergence the bowlder was dropped upon the still soft and yield- 
ing mass of vegetation and sank into it to a considerable depth. 
By what agency it was transported from the shores of that ancient 
sea to its present resting place is uncertain, Two similar cases 
are on record, an o eminent Ohio geologists have speculated 
ps the causes of phenomena. Pro ndrews 
(Report of Progress, 1870, p. 78) mentions a lar e quartzite 
Newberry (Ohio Reports, vol. ii, p. 174 mentions one of taleose 
slate found by him in Coal No. 2,in Mahoning spe ty, ~e be eee 
winds, or carrie by currents, to where we now fin bie 
penetrated the material of the ect by virtue of thelr elanit and 
compactness, while the mud carried by the same waters spread 
over the coal a ress : fine vollhneit without poe raat it. 
Granville, Nov. 19th, 1 KS. 
shburner on Otte Records in McKean and "Blk ‘Conn: 
of the preceding volume, the sentence reading “‘ We are sure that 
the rocks maintain a constant foie: bateont these two points,” 
should read “ We are not sure,’ 
Ill. Botany AND ZooLoey. 
1, Flora Brasiliensis—The publication has ma erent pro- 
gress during the year 1878. In February > es 75 
and 76; Be a3 une Lana 77, in August fase. 78... The ie es va ite 
of publica 
Pigs. by Dr. J. Peyritsch, Curator of the Vienna 
