Bibliography. 369 
small fall transverse the British or Horse Shoe Fall, which has since 
disappeared ; (the same is given also in Mr. Hall’s Final Report of the 
Geology of New York.) ‘The sections at the Falls, of Goat Island, the 
Summer House, and the strata along the Niagara river from Lake On- 
tario to Lake Erie are somewhat the same also that Mr. Hall has given 
in his Final Report above mentioned. At p.205, Vol. I, is a good litho- 
graphic plate of the remains of fossil mammalia, found by Mr. L. at Mar- 
tha’s Vineyard in the tertiary cliffs of “‘Gay Head.” Vol. II is faced 
by a “ geological map of the United States, Canada,” &c., compiled by 
Mr. Lyell from various authorities which he cites in one corner of the 
map. We believe that Mr. Hall’s map of a portion of the same regions, in 
his Final Report and the present, are the only published geological maps 
of the United States since the one by Mr. Maclure in 1817. Although 
the present one is confessedly very imperfect in many important points, 
it is still a valuable addition to our previous knowledge, and must serve 
as a useful guide until we are supplied with a better. There are also 
many wood cuts to illustrate several passages in the text. . 
Mr. Lyell’s route in this country was mainly as follows: from Boston 
through Springfield by Connecticut River to New Haven, where he 
made, in company with Dr. Percival, and the editors of this Journal 
and others, an excursion to some of the trap hills and sandstone beds 
of the southern part of the new red sandstone of the Connecticut val- 
ley; thence he went to New York, and by the Hudson to Albany. 
In company with Mr. Hall he crossed the state of New York and ex- 
amined for the first time the Falls of Niagara, (he was there again the 
next year;) he then went to western Pennsylvania, entering the coal 
region at Blossburg, and returning again via Seneca Lake and Geneva 
to Albany. He here rejoined Mr. Hall and examined two swamps in 
Albany and Green Counties, where mastodon remains have been found ; 
and after a tour to the Helderberg tosee the upper Silurian strata and study 
their fossils in Mr. Gebhard’s cabinet, he went to New York and Phila- 
delphia. Mr. Conrad here accompanied him in a jaunt to the creta- 
ceous strata of New Jersey, which occupied three days; and on their 
return, Prof. Henry D. Rogers conducted him through the anthracite 
formation of Pennsylvania, and explained the curious structure and origin 
of the Apalachian chain. He then returned to Boston, where he was 
occupied during the six weeks following (Oct. 14) in his course of geo- 
logical lectures before the Lowell Institute, making occasional excur- 
sions in the vicinity. From Boston he again returned to New Haven, 
and after a day’s excursion with several gentlemen acquainted with the 
localities te the fish beds at Durham, he passed rapidly south to spend the 
severer months of anorthern winter in examining the tertiary of the south- 
ern states. After leaving Washington City he examined the eocene marls 
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