CONTENTS. 
' Page 
Introduction 1 
Crystallography, by E. Poitevin 2 
Chemical properties, by H. V. Ellsworth 15 
Illustrations. 
Plate I. Specimen of mass of gypsum coated with crystals of inyoite and 
selenite, from Hillsborough, N.B Frontispiece 
II. Enlarged view of specimen in Plate 1 19 
III. Another view of specimen figured in Plate I, showing fissures partly 
filled by inyoite crystals 21 
Figure 1. Gnomonic projection showing distribution of faces on inyoite from 
Hillsborough, N.B 2 
2. Common habit of inyoite from Hillsborough, N.B 10 
3. Crystal drawn with the clinopinacoid b(010) facing observer 11 ■ 
4. Crystal slightly elongated in the direction of c-axis . 11 
5. Crystal slightly different from the common habits 12 
6. Crystal slightly different from the common habits drawn with the clino- 
pinacoid facing the observer 12 
7. Parallel growth of crystals drawn with the clinopinacoid facing the 
observer 13 
8. Showing the optical orientation of inyoite *, 15 
9. Graph showing water loss of inyoite on heating at increasing temperatures 16 
10. Graph showing water loss of inyoite on heating at 110 degrees C 17 
