154 Association of American Geologists and Naturalists. 
regard to the bowl-shaped cavities, encircled on all sides by regu- 
lar hills, he suggested that they might have been worn by the 
rotary motion of icebergs; this rotary, or semi-rotary motion of 
the icebergs, he had noticed both in those which were and were 
not stranded. ‘They become gradually worn away on one side 
by the action of the water, when they turn over with a displace- 
ment of the sea, and violent upheaving of the mud and sand, ren- 
dering the water turbid to a great distance. 
The discussion was continued by Mr. Lyell and Mr. Couthouy, 
on the probable agency of icebergs in diluvial phenomena, and 
especially in regard to the water-worn cavities or pot holes. 
Dr. C. T. Jackson described the pot holes which occur in 
Orange, near Canaan, in the elevated land’ between the Connecti- 
cut and Merrimack rivers in N. Hampshire. 'Fhey are worn in @ 
hard granite-gneiss, in a line following the general N. and 8. di- 
rection of the diluvial or drift current.. One which had been clear- 
ed of the round smooth stones which formerly filled it, and which 
is known to the inhabitants as “the well,” is Slaven feet deep, 
four and a quarter feet wide at the top, and two feet at the bottom. 
These pot holes could not be referred to the action of any exist- 
ing current of water, as they are on the water-shed line, between 
the two rivers, and more than one thousand feet above the a 
level. 
Mr. John H. Blake was requested to ) prepare a paper on the 
tertiary and drift of the Andes 
Prof. H. D. Rogers reinarked in relation to stranded incall 
that coming from the north, loaded with bowlders, and stranded 
far above the sea level, they would, while melting, aan 9 
the phenomena of the slncbor of the Alps 
Mr. Couthouy was requested to dita up a paper, embracing 
the facts which he had collected in regard to icebergs, to lay be 
fore the Association. Mr. C. having, in accordance with this re- 
quest, prepared the following summary of his observations and the 
remarks he had made concerning them, at the present session, it 
is here inserted. 
Mr. €. premised that in order: to give the remarks he was about to 
suibiait, their full weight, it might be proper for him to state, that he had 
no preconceived éd opinion—no hypothesis of his own upon this question, 
i mame His intention was simply to offer a few facts which had 
ler his personal observ — the inferences to which they 
