82 The Sedimentary, Metamorphic, 



had then been filled by a new generation of quartz grains, 

 forming a wedge-shaped vein. In this secondary quartz 

 there are very numerous minute and well-formed crystals of 

 chlorite, of the variety which has been called Helminth, from 

 its curious resemblance to larval forms. 



Some of these crystals are geniculated, and show both the 

 basal and prismatic planes. They are not strongly dich 

 in shades of green to colourless. 



I have mentioned the numerous crystalline-granular veins 

 which traverse the schists at this place. I prepared a slice 

 of one at the junction of Watts Creek. It is composed as 

 follows : — (a) Felspars which are almost all triclinic and of 

 very poly synthetic structure; none have any external planes 

 remaining, but are broken and eroded in a great degree. 

 Some of the felspars are much larger than others, and there 

 are also mere fragments in the interspaces. The composition 

 is mostly according to the Albite law, and the obscuration 



angles are low, being in the zone OP — go P oo between 4° 

 and 12°, (h) Chlorite chrystals after mica in small 

 amount, (c) Quartz in considerable amount filling in all 

 spaces. 



This vein is a variety of aplite. 



A second example from another vein here is, as seen in the 

 hand specimen, a mixture of reddish felspar, quartz, and a 

 little chlorite, with rarely plates of alkali-mica. In a thin 

 slice I observed : (a) Very irregularly-shaped and broken 

 crystals of orthoclase, which include a few rounded quartz 

 grains ; (6) a lesser number of triclinic felspars ; (c) a very 

 little chlorite after magnesia-mica ; (d) quartz as the residual 

 mineral. The felspars are all more or less altered to mica, 

 and the ultimate result seems to be pinite pseudomorphs, 

 with some alkali-mica. 



This rock is also an aplite. 



I now proceed to trace up the Little River for a short 

 distance before following Watts Creek, which lies along the 

 course of the descriptive section. 



Above the ford and on the south bank of the Little River 

 (marked 1G on the plan), there are rocks which have characters 

 intermediate between the schists which I have described 

 and the other more massive metamorphic rocks. They are 

 in places crystalline-granular, and in others schistose. They 

 are much jointed, and also traversed by veins and strings of 

 quartz, and contain some foliation, such as these I have 



