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





No 



.III. 





ksnearlyec 



maltol09 2S ! S. 



Angl 



1. . , 



. 109 



1. 



2. 





. 104 



2. 



3. . 





. 108 30 



3. 



4. 





. 104 



4. 



5. 





. 105 



5. 



6. 





. 102 



6. 



7. 





. 112 



7. 



Me 



an 



. .106 21 





No. IV. 

 Anglesnearly equal tol!6° 26'. 



117 



122 30 



118 



117 30 



118 



123 

 122 



Mean 



119 42 



The angles already described are those belonging to four of 

 the geometrical solids inscribable in a sphere, viz. — 



1. 



Hexahedron 



. 90 



18 angles 



2. 



Tetrahedron . 



. 70 31-7 



19 „ 



3. 



Octahedron 



. 109 28-3 



7 „ 



4. 



Dodecahedron . 



. 116 26 



7 „ 







Total . . 



■ 51 „ 



The remaining angles observed cannot be reduced to any of 

 the preceding, but may be classified empirically as follows : — 



No. V. Angles observed. 



1. . 



. . 60 



2. . 



. . 59 30 



3. . 



. .52 



4. . 



. . 59 30 



5. . 



..60 



6. . 



. . 64 



Mean 



59 9 



No. VI. Angles observed. 



1. . 



. 99 



2. . 



. 97 



3. . 



. 99 30 



4. . 



.101 



5. . 



. 99 



6. . 



. 97 



7. . 



. 101 



Mean 



99 4 



No. VII. Angles observed. 



1. 82° O 



2. 82 



3. . 80 O 



4. 78 € 



5. 77 



6. 81 



7. 79 



8. ...... . 83 



Mean .... 80 15 



