CONTENTS. 
PAPERS. 
The Introduction to Lobachevski’s New Elements of Geometry; 
George Bruce Halsted, Ph. D. 1 
An Address to the Texas Academy of Science; Gov. L. S. Ross. ... 19 
The Essential Differences Between Man and Other Animals; . 
Sidney E. Mezes, Ph. D 23 
Pedagogical Notes on Mensuration ; Arthur Lefevre, C. E 39 
Science and the State — Annual Address by the President; 
Thomas U. Taylor, M. C. E 45 
Some New Measurements of Electric Waves (with six diagrams in 
text); R. S. Hyer, A.M 57 
Note on the Descent of Erythronium Bulbs into the Soil (with 
two figures in text); O. C. Charlton, M.A 69 
Variations in Indian Corn when Brought from New York to 
Texas; H. Ness, M. A. 73 
An UInusual Case of Emphysema (with two photographs); H. W. Har- 
per, M.D., and W. W. Norman, M.A 79 
ABSTRACTS. 
A Coahuilan Hacienda; J. C. Nagle, M.A 81 
A New Suggestion Concerning the Transmutation of Matter; 
H. W. Harper, M. D 84 
Recent Publications Relating to Texas Geology; Frederic W. 
Simonds, Ph. D 86 
Epsom Salts, Magnesium Sulphate, from Brown County, Texas; 
H. W. Harper, M.D 91 
BIBLIOGRAPHY. 
The Physical Geography, Geology, and Natural Resources of 
Texas; E. T. Dumble 93 
Water Analyses — From Springs and Artesian Wells In and Near 
Austin, Texas; H. W. Harper, M.D 94 
Hydrazine Derivatives of Propionic Acid; Jas. R. Bailey, Ph.D. ... 94 
Titles of Papers Read before the Academy from Dec. 10, 1897, to 
Dec. 28, 1898 95 
Officers and Council for 1898 98 
List of Patrons and Fellows 99 
List of Members 101 
List of Publication Exchanges 105 
Financial Statement 110 
