310 W. F. SMEETH. 



The other class consists of true crystallites, and is mainly repre- 

 sented by a form which I believe is uncommon. This is built up 

 of a central axis, generally strongly curved, along which are 

 ranged rows of globulites. Two rows of globulites are always 

 visible, and sometimes a third can be detected, and leads one to 

 surmise that a fourth row is present on the under side. The 

 globulites are somewhat ovoid in shape and are occasionally 

 composite. Frequently a portion of the axis projects free at one 

 end, and it may then be seen to be serrated suggesting the partial 

 fusion of a single row of globulites (Plate 46, fig. 2). 



A form described by Zirkel as consisting of rows of cuneiform 

 grains placed axially along a central line appears to be akin to 

 that here described, and I think the designation 'granular axiolite,' 

 which he uses may serve very well for the latter. 



The individuals are always distinct and average a greater length 

 (•05 mms.) than the microliths mentioned above. They are much 

 contorted and curve about independently of the lines of flow 

 except in places where there has been considerable differential 

 motion in the current as in going round some of the larger crystals. 

 No evidence of transition of the crystallites into the microliths 

 is observable. Isolated globulites are rare, and margarites 

 can occasionally be detected. In order to explain the fact that 

 these crystallites are generally much curved, and in all directions 

 to the flow I would suggest that in the flowing mass there were 

 numerous minute whirls or eddies, and that these elementary 

 bodies had not attained sufficient rigidity to resist their distorting 

 action up to the cessation of flow. This is supported by the fact 

 that these bodies are straightened out along the lines of flow where 

 there was a strong set, and on the other hand become broken up 

 where the motion appears to have been turbulent. 



Accessory minerals. — A few slender prisms of apatite are present 

 and some short prismatic grains of zircon. These may have been 

 derived, along with the magnetite from the hypersthene. A few 

 grains of a blue doubly-refracting mineral occur associated with 

 the zircons which may possibly be sapphire. 



