XXXVI 
Proceedings. 
Collin, Dr. A. Ueber die Regenwurmer der Umgegend von 
Berlin. 
- Notiz ueber Guathostoma hispidum Fedsch. aus dem 
Rinde. 
a 
-Criodrilus lacuum Hoffne. 
Committee ot Colorado Scientific Society. Report on the Tech¬ 
nical Determination of Zinc. 
Comstock, G-eorge C. Provisional Results of a Determination 
of the Constant of Aberration. 
Comstock, Dr. Theo. B. University of Arizona School of 
Mines, Plan of Organization, Equipment and Relations to 
the Public, Bulletin No 1. 
- Oil and Natural gas in Illinois. 
■- Notes on the G-eology and Mineralogy of San Juan County, 
Colorado. 
- The Geology and Vein-Structure of Southwestern Colorado. 
-A Preliminary Report on dhe Geology of the Central 
Mineral Region of Texas from 1st Annual Report, 1889. 
-Report on the Geology and Mineral Resources of the Cen¬ 
tral Mineral Region of Texas. 
Crepin, F. Observations sur Quelques Plantes fossiles des De¬ 
pots devoniens Rapportes par Dumont a L’Etage quartzo- 
schisteux Inferieur de son Systeme Eifelien. 
- Fragments Paleontologiques pour Servir a la Flore du 
Terrain Houiller de Belgique. 
-Materiaux pour servir a L’Histoire des Roses. Parts III 
and IV. 
- Note sur le Pecopteris Odontopteroides Morris. 
Cross, Whitman. Post Laramie Deposits of Colorado. 
- Constitution and Origin of Spherulites in Acid Eruptive 
Rocks. 
- The Post-Laramie Beds of Middle Park, Colo. 
Cross, Whitman and Eakins, L. G. A new Occurrence of Ptilo- 
lite. 
Culver, G. E. On a Little Known Region of Northwestern 
Montana. 
Culver, G. E. and Hobbs, Wm. H. On a new Occurence of 
Olivine Diabase in Minnehaha Co., South Dakota. 
