134 TRAVIS— PYRITE FROM CORNWALL. [June 22 



552A111. 



Measured 19° 25' (No. 7.) 



Measured 19° 10' ) ,_ . ,. . 



,, J o / (■ (Two faces on No. 10) 



Measured I9 34 i 



Calculated 19° 28' 



The measurements on crystal 6 are near enough to identify the form 

 after its presence has been established by the above, — 



Measured 19° 03' 



Measured 19° 02' 



(Two faces on No. 6, measured by direct observation on the face, which was 



too narrow to give a visible reflection.) 



(773) One face of this form (new for pyrite) was observed on 

 crystal 10. The face is quite narrow (o.i mm.), but is sharp and 

 gives a reasonably good reflection. 



773AI"- 



Measured 18° 28' 



Calculated 18° 24' 



(221) is a common form, and was observed on all the crystals 

 measured, — 



221 1\ III. 



Measured 15° 54' 



Measured 15° 58' (on various crystals ; 



Measured I5° 42' signal generally good) 



Measured 15° 46' 



etc. 



Calculated 15'' 47^' 



(This observation shows the degree of accuracy to be expected in 

 the present work.) 



(774), a new form for pyrite, was observed on crystal 3, with 

 one narrow face between (221) and (m). 



774AIII. 



Measured 13° 05' (signal rather good) 



Calculated 13° 16' 



(553 )> observed on crystals i and 7. 



553A"i- 



Measured 12° 22' (No. i, signal poor) 



Measured 12° 14' (No. 7) 



Calculated 12° 16' 



(332), observed on crystal i. The zone containing it is some- 

 what rounded between (221) and (m), and gives by reflection a 



