754 Proceedings of Scientific Socteties. [July, 1884 , 
age, lying sixty or seventy miles distant from any similar rock, 
and in a mountain pass famous in history. Size five to six by 
three to four feet high. The edges are full of sharp serrations, 
and the weight must be at least five and one-half tons. The stone 
has a notch by which the blood flowed off. ¿ 
March 7.—Professor Cope read a paper entitled “ On the Struc 
ture of the Skull in the Elasmobranch genus Didymodus.” 
Mr. Ashburner presented some notes “On the aneroid hyp- 
sometry,” and exhibited a self-registering field instrument. 
March 21.—A communication from Professor Claypole, entitled 
“On the Clinton and other shales composing the Fifth Group of 
Rogers in the first survey of Pennsylvania,” was read. 
April 4.—Professor Lesley read from a letter of J. F. Carll, a 
correction of the horizon of Eurypterus pennsylvanicus, described 
r. C. E. Hall, The fossil was found seventy-two feet above 
the mouth of the Pithole well, z. e., 167 feet above the Berea or 
Pithole grit. - i 
Mr. Blasius read a paper on the unhealthy condition of certam 
portions of great cities, owing to prevalent winds, and spoke 
the necessity of rapid transit. 
NATURAL SCIENCE ASSOCIATION OF STATEN IsLanD, May 10— 
In the absence of the president, Dr. Britton was elected chair- 
man pro tem. Three new members were elected and other bus 
ness transacted, after which Mr. Hollick read a paper upon ‘si 
cent discoveries of Indian Implements at Tottenville.” The sý 
lowing is a complete list of the different objects thus far foun 3 
one axe, one pipe, five hammer stones, ten arrow-heads, thirty 
and fragments. Itis but little more than a year sin U 
these was accidentally discovered while on a field pea? a 
the locality. Since then, whenever the place has been visite? & 
searched, relics have invariably been found. Mr. George + 
Kunz, of New York, who was present by invitation, then co 
sented the stone head found near Clifton, and gave the pan 2 
account of the same: As now preserved it shows the m je 
of which it was formed to be a brown sandstone, apparently posed 
compact than the common New Jersey sandstone, ae peb- 
hand piece of work by a stonemaker; the style m fg antiquity 
_ or Eastern; rendering it unlikely that it is a part more 
thrown away by some sailor; it is rather Mexican, and a it is 
resembles Aztec work. This leads to the inference fi that it 
probably of Indian origin, or if not, it is remotely poss! z 
was made by the early Dutch. 
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