460 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



TABLE V. 



Leadhillite. Monoclinic. 



a = 0.S742 

 c = 1.1122 



m = I 



180° — J 



89° 30i' 



log a = 9.94165 

 log c = 0.04618 



}°S h = 19.99998 

 log sm /a ) 



log a„ =9.89546 

 log b =9.95382 



Jog e = I T 93398 

 log cos ix ) 



log p = 0.10454 

 log q = 0.04618 



log P° = 0.05836 



a = 0.7861 

 b = 0.8992 



h = 0.99996 



p = 1.2721 

 q„ =1.1122 



e = 0.0086 



30 



00 



90 00 



77 40 



66 23 



59 46 



48 50 



37 20 



29 46 



28 



2S 



26 



00 

 90 00 



00 

 12 20 

 23 37 

 30 14 

 41 10 

 52 40 

 60 14 

 15 32 

 20 20 

 29 05 



24 36 33 



39 50 

 48 02 

 59 04 

 61 39 

 65 48 

 70 13 

 73 19 

 00 



0.00S6 

 



00 



4.5753 x 

 2.2877 x 

 1.7158 x 

 1.1439 1 

 0.7626 1 

 0.5719 1 

 0.0086 



5.0974 







GO 







00 



0.2780 

 0.3707 

 0.5561 

 0.7414 

 0.S34 1 

 1.1121 

 1.6682 

 1.8535 

 2.2242 

 2.7803 

 3.3363 

 



d'= tan p 



0.0086 



co 



0.2782 

 0.3708 

 0.5561 

 0.7414 

 0.8341 

 1.1121 

 1 .6682 

 1.8535 

 2.2242 

 2.7803 

 3.3363 

 5.0972 



