ADDITIONS TO THE LIBRARY. 



2 93 



maud of Lieut. E. S. Williamson. With an Appendix containing 

 descriptions of portions of the collection by Louis Agassiz, A. A. 

 Gould, J. W. Bailey, T. A. Conrad, John Torrey, G. C. Schacffer, 

 and J. D. Easter. 4to. New York, 185S. Purchased. 



Bohemia. Naturwissenschaftliche Landesdurchforschung von Boh- 

 men. Archiv, Band IV. No. 2 (1880). Erlauterungen zur geolo- 

 gischen Karte der Umgebungen von Prag, von J. Krejci und 

 E. Helmhacker. 8vo. Prague, 1880. Purchased. 



Bonnei/, T. G. Note on a Case of Prismatic Structure in Ice. 8vo. 



. On Traces of Glacial Action near Llandudno. 8vo. London, 



1867. 



. On supposed Pholas Burrows in Derbvshire. 8vo. London, 



1870. 



. On a Cirque in the Syenite Hills of Skve. 8vo. London, 



1871. 



. On the Formation of " Cirques," and their Bearing upon 



Theories attributing the Excavation of Alpine Valleys mainly to 

 the Action of Glaciers. 8vo. London, 1871. 



. Ice Scratches in Derbyshire. 8vo. London, 1872. 



. On certain Lithodomous Perforations in Derbyshire. 8vo. 



London, 1872. 



■ . Notes on the Eoslyn-Hill Clay-pit. 8vo. London, 1872. 



. Lakes of the North-eastern Alps and their Bearing on the 



Glacier-Erosion Theory. 8vo. London, 1873. 



. On the Occurrence of a Quartzite Boulder in a Coal-seam in 



South Staffordshire. 8vo. London, 1873. 



. Some Notes on Glaciers. 8vo. London, 1876. 



. On Columnar, Fissile, and Spheroidal Structure. 8vo. London, 



1876. 



— — . On certain Eock-structures, as illustrated by Pitchstones 



and Pelsites in Arran. 8vo. London, 1877. 

 . On Mr. Holland's Theory of the Formation of Cirques. 8vo. 



London, 1877. 



. On the Microscopic Structure of Luxullianite. 8vo. Truro, 



1877. 



. On the Serpentine and associated Eocks of the Lizard 



District. With Notes on the Chemical Composition of some of 

 the Eocks of the Lizard District. By W. H. Hudleston. 8vo. 

 London, 1877. 



. The Lherzolite of the Ariege. 8vo. London, 1877. 



. On some Specimens of Gabbro from the Pennine Alps. 8vo. 



Truro, 1878. 



. On the Serpentine and associated Igneous Eocks of the 



Ayrshire Coast. 8vo. London, 1878. 



