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PROCEEDINGS OE THE TEXAS ACADEMY OF SCIENCE, 
San Antonio , December 31, 1896. 
Vertical Curves for Railways; J. C. Nagle. 
Hydrazine Derivatives of Propionic Acid; Janies R. Bailey. (By title.) 
Notes on Indian Corn (Zea mais), and some of its uses among the 
ancient and modem Mexicans; Dr. David Cerna. 
Notes on the Physiology of the Central Nervous System of Some of 
the Lower Animals; W. W. Norman. 
Cystiglyphus Trichogenetos (Boecking), a human parasite; Dr. A. E. 
Boecking. (By title.) 
The Evolution of Culture; Thomas Fitz-Hugh. 
A New Suggestion concerning the Transmutation of Matter; Dr. H. 
W. Harper. (By title.) 
The Cervanka Gas Well; E. T. Dumhle. (By title.) 
Address—The Economics of Concentrated Capital; Major C. E. 
Dutton. 
The Greatest Foundling House in the World: A Personal Study in 
Russian Sociology; Dr. George Bruce Halsted. 
ABSTRACT OF PAPERS. 
BY FREDERIC W. SIMONDS. 
On the Discovery and Occurrence of Mica in North Carolina. (Read 
April 2, 1892.) 
In this paper the author gives some of the results of his investigations 
in the Blue Ridge regions of North Carolina. The occurrence of mica 
in Mitchell, Yancey and Macon counties is discusssed, and the story of 
its discovery told. (See “Commercial Mica in North Carolina: The Story 
of its Discovery/’ Science, N. S., Vol. IV, No. 89, September 11, 1896.) 
The Lower Carboniferous Rocks of Northwest Arkansas. (Read May 
7, 1892.) 
This paper is an abstract of a part of a report on the geology of 
Washington county, Arkansas, recently completed by the author. (See 
“Geology of Washington County,” in Annual Report of the Geological 
Survey of Arkansas for 1888, Vol. IV, Little Rock, 1891, pp. 1-148.) It 
deals largely with a complete section of the Lower Carboniferous rocks 
from the Silurian to the Coal Measures (the Devonian being doubtfully 
