CONTENTS OF VOLUME I. 



Page 



No. 1. On the speed of liberation of iodine in solutions of hydro- 

 chloric acid, potassium chlorate, and potassium iodide, 

 by Herman Schlundt, Assistant in Chemistry 1 



No. 2. On the quartz keratophyre and associated rocks of the North 



Range of the Baraboo Bluffs, by Samuel Weidman 34 



No. 3. Studies in spherical and practical astronomy, by George C. 



Comstock, Director of the Washburn Observatory 57 



No. 4. A contribution to the mineralogy of Wisconsin, by William 

 Herbert Hobbs, Assistant Professor of Mineralogy and 

 Petrology 109 



No. 5. Analytic keys to the genera and species of North American 



mosses, by Charles R. Barnes, Professor of Botany 157 



INDEX TO PLATES. 



Opposite page 

 Plate 1. Geological map of a portion of the North Range of the 



Baraboo Bluffs 35 



Plates 2 and 3. Photographs of thin sections of volcanic rocks from 



the North Range of the Baraboo Bluffs 56 



Plates 4-8. Drawings of crystals from Wisconsin 156 



