226 PEOF. BOSWELL ON THE CBETACEOTTS AND [vol. lxxix,, 



Table oe Mineral Occlrbences. 



1 







^ 











5> 











§ 





















s. 











o 











PP. 



^ 







"« 





~; 





S 

 | 



8 



s 



pq 



s 



1 



Sa 

 S 



P=l 



I 1 

 o 



pq 



8 



O 



■a 



a 



§ 



o 



Pi 



3, 



if 











o 



o 



« 



>o 



IO 







<» 









•2 s 















o 



^> 









o 



C 







<vb 



N 



' 



o 



O 



Ph 



4 



1 



7 





1 



1 



1 



1 





1 

















6 



3 

 1 



7 



2 

 5 

 2 





5 

 9, 



5 



9 



3 

 1 



5 



5 



— 



5 



4 







7 



8 



8 



9 



8 



8 



7 



4 

 9 



8 

 8 





8 



9 



q 



9 



9 



9 



9 





9, 

















1 



9, 



3 



91 



?, 



fi 



fi 



1 



9 



4 



q 



1 

 10 







10 

 10 



10 



10 



10 

 10 



10 

 10 



10 

 10 



10 

 10 



10 

 10 



10 

 10 



10 

 10 



10 





Tourmaline (blue & brown) ... 



9 



9 



9 



9 



9 



9 



9 



9 





8 

 5 



9 



7 

 4 



7 

 1 



3 

 2 



4 



3 



1 

 3 



9 

 5 



8 



8 

 4 



— 



9 



2 

 5 













fi 



q 



7 



2 



3 



8 







5 



8 

 3 







1 

 l 



91 



1 



1 

 1 



1 

 3 



— 



1 



Epidote 





9 



3 



1 





3 



1 



3 

 1 



7 



— 





Hornblende 





9 



fi 



2 

 5 



2 



8 



5 



? 

 9 



— 



— 



10 







— 



2 



— 



3 



— 



2 



— 



10 



2 







— 







— 



— 



— 



a 







. 



9 





7 



ft 



1 











91 



_ 





8 





3 



4 



3 



5 



7 



7 



7 



7 





10 



10 

 10 



10 

 10 



10 



10 



5 



10 



10 





10 

 10 



Flint 





* Grains showing a well-developed black cross. 



f Confirmed spectroscopically. 



j Absent at Crouza Down, Lizard. 



The indication of relative ahundance by means of numbers seems first to have 

 been introduced by E. Artini, 1 whose scale ran from l=very abundant to 10=very 

 rare. Later, F. Salmojraghi 2 reversed the order, and used the following scheme: 

 l=exceedingly rare; 2=rare; 3=very scarce; 4=scarce; 5=frequent; 6=very 

 frequent; 7 = abundant; 8= very abundant; 9=dominant; 10=ultradominant. 

 This scheme, which is similar to that devised recently (and independently) by 

 Prof. W. W. Watts, is used in the above table. 



i Riv. di Min. & Crist. Ital. vol. xix (1898) pp. 33-94. 

 2 Rendic. 1st. Lomb. Sci. Lett. vol. xl (1907) pp. 870-87. 



