1906.J TRAVIS— PYRITE FROM CORNWALL. 135 



continuous band. The two principal faces in the zone (332) and 

 (553), however, give distinct, measurable reflections. 



332 A "I- 



Measured 10° 00' (signal poor) 



Calculated 10° 1^2 



This close agreement, however, must be regarded as accidental. 



(443), a new form for pyrite, was observed on crystals 6 and 10. 



443A"i- 



Measured f 28' (No. 6) 



Measured 7° 05' (No. 10) 



Calculated 7" 20' 



(554) > a new form, was observed on crystals i and 6, with one 

 face on each. The form is small but distinct. 



5S4AIII- 



Measured 5** 46' (No. i) 



Calculated 5° 46' •• 



554 A 221. 



Measured 10* 2! (No. 6, mean of two re- 

 Calculated 10** V/^' flections at 9° 49' and 



10° 15' from 221) 



The agreement, curiously enough, is exact in each case, but this 

 must be accidental. 



(665), a new form, was observed as one small face on crystal 10. 



665 A III. 



Measured 4° 35' (signal rather good) 



Calculated 4° 45' 



Fig. 3. Type L Fig. 4. Type I. 



The diploids (421) (137.3) ^^d (952) in the zone (112) appear 

 as small, bright, triangular faces between (m) and (210), cutting 



PROC. AMER. PHIL. SOC,, 1 83 I, PRINTED OCT, 27, I906. 



