CONTENTS. 
JANUARY NUMBER. 
Brevity of Tuff-Cone Eruption. S. E. Bislwp. [Plate I.] i 
Possible New Co.\l Pl.xnts, Etc., in Coal. Part III. [Plates 
II-VIIL] W. S. Grcslcy 6 
On the Petrography of Mount Orford. John A. Dresser 14 
On Some Newly Discovered Areas of Nepheline Syenyte in 
Central Canada. U'illct G. Miller 21 
Peneplains of the Ozark Highland. Osear H. Hershey 25 
Correspondence. 
Troost's Survey of Philadelphia, 6^. Harbert Hamilton, 41 ; 
New York Academy of Sciences, Section of Geolog}^ and Min- 
eralogy, Thco. G. White, 42 ; A Single Occurrence of Glacia- 
tion in Siberia, C. JV. P%triiigton, 45. 
Review of Recent Geological Literature. 
Ueber Aulacamerella ein neues Brachiopodengeschecht, Fried- 
rich Baron Hoyningen-Huene, 47; Supplement zu der Beschrei- 
bung der Silurischen Craniaden der 0.stseelander, Same Au- 
thor, 47 ; A text-book of important minerals and rocks, S. E. 
Tillman, 48; Progress of Mineralogy in 1899, -S*- Harbert Ham- 
ilton and James R. IVitJiroiv, 48; New Species of Cambrian 
Fossils from Cape Breton, G. F. Mafthezi', 49; The Action of 
Ammonium Chloride upon Natrolitc, Scolecite, Prehnite and 
Pectolitc, F. IF. Clark and George Steigcr, 49; Chemical Com- 
position of Turquois, 5". L. Penfield, 50 ; A new meteorite from 
Oakley, Logan County, Kansas, H. L. Preston, 50; Cambro- 
Silurian Limonite Ores of Pennsylvania, T. C. Hopkins, 50; 
Chemical Composition of Sulphohalite, 5". L. Penfield, 50; 
Siliceous Calcites from the Bad Lands of South Dakota, S. L. 
Penfield and JV. E. Ford, 51 ; Granites of Southern Rhode Isl- 
and and Connecticut, /. /•". Kemp, 51 ; Contact Metamorphism 
of a basic Igneous Rock, i' . S. Grant, 51; Suggestions Regard- 
ing the Classification of the Igneous Rocks, W. H. Ilobbs, 52 ; 
The Nomenclature .of Fcldspathic Granolitcs, hi. 11'. Turner, 
~ti ; Some Contact of Phenomena of the Palisade Dial)ase, /. 
D. Irving, 53; Ueber grosse flache Ueberschiebungen in Dill- 
gebiet, /:. Kayscr, 54: Ueber den nassauischen Culm, E. Kay- 
A-n u n 9. 
