440 PROCEEDINGS OF THE AMERICAN ACADEMY. 



the new forms Q alone is conspicuous by its frequent occurrence, b, d, 

 1, w, e, s, x, q, p, R (a new form), ft, and v are also of frequent occur- 

 rence, being found on from one half to two thirds of the measured 

 crystals. The remaining forms are of minor importance, many of them 

 found on but one or two crystals. 



The new forms are established upon the following data : 



E, — §0 (203). A narrow but distinct face in the orthodome zone 

 on five crystals, giving fair reflections (Figure 6). 



Clinodome Zone. — This zone is usually largely developed and is apt 

 to be deeply and closely striated parallel to the zonal axis, often with 

 a curved surface. The reflection of the signal from these curved sur- 

 faces is a band of light with occasional brighter portions and numerous 

 more or less distinct images of the signal. Most of the latter are in 

 positions corresponding to simple symbols, but only in the cases of 

 those images which were also observed as given by distinct faces has 

 the form been accepted as confirmed. 



v, 0| (014). Observed repeatedly as a signal in the striated clino- 

 dome zone, twice found as a distinct face (Figures 5 and 6). 



