336 PROCEEDINGS OF THE AMERICAN ACADEMY. 



of its having been observed in considerable completeness on at least 

 two occurrences of calcite. 110 Splitting the zone at (3145) = (40l) 

 its point of intersection with zone 4 and developing the portion between 

 (401) and (325) we have: 



Referred to N 4 this zone fragment is incomplete and contains the 

 extra forms |, ^ f E , & and £f. Of these the first, A (6-14-20-7) = 

 (11-5-9), has been discussed under the preceding zone, where, as in 

 this case, it falls in normal series N5. 



J (8-20-28-9) = (15-7-T3). This scalenohedron was observed 

 by Pirsson ni ona single crystal supposed to have come from Mexico. 

 In the combination figured by Pirsson the form is present in combina- 

 tion with (4-16-20-3) and (1341) of the zone under discussion al- 

 though this zonal relation was not apparently tested in the gonimeter. 

 The angles as measured agree well with theory and the pole lies at the 

 intersection of the zones [2021 : 0441] and [0443 : 1120]. The form is 

 probable. 



t (9-23-32-10) = (17-8-15). This scalenohedron was observed 

 by Gonnard 112 on crystals from Couzon, Rhone, France. The form 

 occurs in normal series N5 and marks the intersection of the zones 



HO Palache, C, loc. cit., p. 177. 



Whitlock, H. P., N. Y. State Mus. Bull. 133, p. 219 (1909). 

 ill Pirsson, L.V., Am. Jour. Sci., 41, 61 (1891). 

 112 Gonnard, F., Bull. soc. fr. min., 20, 18 (1897). 



