The Rev. S. Haughton's Notes on Mineralogy. 225 



The fourth specimen of Zeolite to be described occurs in large 

 massive nodules, filling- cavities in trap, of feathery structure, 

 and apparently metamorphic in origin. 



No. 4. Harringtonite. Spec. grav. = 2*174. 



Oxygen. 



Silica . 



Alumina 



Lime 



Magnesia 



Soda 



Potash . 



Water . 



45-60 

 27-30 

 12-12 

 trace 

 2-76 

 0-63 

 12-99 



23-676 

 12-760 

 3-444^ 



0-707 [ 

 0-106J 

 11-545 



4-257 



101-40 52-238 



This mineral is identical with the Harringtonite of the books ; 

 but it seems difficult to assign its true formula. 



No. XVII. On the Geometrical Forms of Gall- Stones. 

 The gall-stones examined by me, whose geometrical figures 

 are here noticed, were taken, after death, from six individuals; 

 and I am indebted, for the opportunity of describing them, to 

 Dr. Banks, Dr. Fleming, Dr. Foot, and Mr. Duffey. 



The dihedral angles were measured by the goniometer, and 

 may be classified as follows : — 



No. II. 

 Angles nearly equal to 70° 31'- 7. 





No 



I. 





Angles nearly 



■ equal to 90°. 



1. 



# 



t 



90 b 



2. 



. 



# 



90 15 



3. 



, 



. 



90 



4. 



. 



, 



90 



5. 



, 



, 



94 30 



6. 



, 



, 



90 



7. 



, 



, 



90 



8. 



. 



# 



90 



9. 



, 



, 



91 



10. 



. 



, 



90 



11. 



, 



, 



89 15 



12. 



, 



, 



88 



13. 



, 



, , 



86 9 



14. 



. 



, , 



89 30 



15. 



, 



, , 



92 



16. 



, 



, , 



94 



17. 



, 



, , 



94 



18. 



. 



. 



90 



Mean 



, . 



90~28J 



1. . . 



. 74 15 



2. . . 



. 75 



3. . . 



. 72 30 



4. . . 



. 69 30 



5. . . 



. 71 



6. . . 



. 70 



7. . . 



. 71 30 



8. . . 



. 72 30 



9. . . 



. 67 



10. . . 



. 66 



11. . . 



. 67 



12. . . 



. 72 



13. . . 



. 72 30 



14. . 



. 72 



15. . 



. 73 



16. . 



. 72 



17. . 



. . 70 



18. . 



. . 68 



19. . 



. . 73 



Mean 



. . 70 59 



Phil, Mag. S. 4. Vol. 32. No. 315. Sept. 1SGG. 



Q 



