TABLES 



CRYSTALLINE FORMS INTRODUCED INTO THE DESCRIPTIVE PART OF THIS WORK, 



WITH THE MEASDEEMENTB OP THEIR SEVERAL ANGLES. 



[The %UTes in the tables correspond to those in the body of the work.] 



SULPHUR. Figs. 14 and 15. Page 181. 



Fig. 14. The primary, an octahedron with 

 a rhombic base. 

 P on P .. 106°38' and 84° 58' 

 P on P' .. 144 17 {Beudant); 

 143 7 48 {Haiiy). 

 P on r .. 108 26 6 {Hauy). 



GRAPHITE. Fig. 16. Page 186. 



Six-sided tables cleaveable into rhombs in 

 the direction of the dotted lines. 



GLAUBER'S SALT. Figs. 17 and 18. Page 196. 



Fig. 17. The primary, an oblique rhombic 

 prism. 



M on M' 99° 36'; 



or, according to Haiiy, an octahedron 

 with a rhombic base, Fig. 18. 



NATRON. Figs. 19 and 20. Page 197. 



Fig. 20. The primary, according to Haiiy. 



P onP 143° 8' 



P onP' 113 54 



NATRON. 



Fig. 19. A secondary form from solution. 

 Pono 140°46' 



COMMON SALT. Figs. 21 and 23. Pago 198. 



Fig. 21. The primary, a cube. 



Fig. 22. A hollow quadrangular pyramid 



formed by the slow evaporation of a 



solution of common salt. 



SULPHATE OF POTASH, 

 elusive. Pago 201. 



Figs. 23 to 25 in- 



Fig. 23. The primary, a right rhombic 



prism. 

 M on M' .. 118° 8' (Beudant.) 

 Figs. 24 and 25, other forms of sulphate 



of potash. 



ALUM. Figs. 26 to 28 inclusive. Page 203. 



Fig. 26. The primary a regular octahe- 

 dron. 



Figs. 27 and 28, modifications of the 

 primary. 



