TABLE OF CONTENTS. 
xiii 
Page. 
Examples and localities. 33 
Sink-holeSj their causes and localities. 36 
Action of frost and chemical agencies. 36 
Disintegration. 37 
A cause of alluvion. 37 
Lightning, effects of, on rocks. 38 
Causes of disintegration. 39 
Transportation by floating ice. 39 
Examples. 40 
Above the water level .. 40 
Of blocks of rock near the shores of lakes. 41 
By ground ice. 41 
By running water, Fairhaven falls. 42 
Excavating action of water on soft strata. 42 
And deposition of alluvia. 42 
Great storm and flood at Catskill. 42 
Flood on Black creek. 43 
Bones, &c. in alluvial depositions . 44 
Mastodon and mammoth in eastern New-York. 44 
Habits of these animals. 44 
Certainty of conclusions deduced from comparative anatomy. 45 
Mastodon. 47 
Infusoria. Introductory remarks... 48 
Ehrenberg on American fossil infusoria, with notes by Prof. Bailey. 48 
Prof. Bailey on American Bacillaria. 50 
Ehrenberg’s classification. 51 
General characteristics and habits. 53 
Bacillaria.. 51 
1. Desmidiacea . 54 
Desmidium. 54 
Staurastrum. 54 
Pentasterias. 55 
Tessararthra. 55 
Sphasrastrum . 55 
Xanthidium. 55 
Arthrodesmus. 56 
Odontella. 57 
Micrasterias. 57 
Euastrum. 57 
Closterium. 60 
Discussion of the animal nature of the Closteria. 60 
Microtheca. 65 
