Geology and Mineralogy. 407 



made during the writer's residence there between 1872 and 1879. 

 The crystals of washingtonite found were of the ordinary type, 

 flattened hexagonal prisms, with the alternate angles replaced by 

 rhombohedral planes. A. (1.) On the west side of the Wolcott- 

 ville road, about two miles northeast of the village of Litchfield, 

 is the "Yale Farm," which extends back to the crest of the ridge 

 running north and south. At some distance down the eastern 

 slope of this ridge, a mass of white quartz rock can be seen 

 standing out conspicuously in the open field. Fine crystals of 

 washingtonite were found in this mass itself as also in the blocks 

 on the slope below that had fallen from it. (2.) On the adjoining 

 farm to the south, owned by a Mr. Smith, near the top of the 

 same ridge, beside a cart path leading up to a small cultivated 

 field, the mica schist crops out in a small grove of hickory trees. 

 Here a number of plates of washingtonite, without well defined 

 angles, were found in the rock, associated with well preserved 

 crystals of staurolite of a dark brown color. 



B. Just east of the village of Litchfield below the point where 

 the road to the Naugatuck station crosses the Bantam river, there 

 is a mill dam, the abutment at the western end of which is formed 

 by a ledge of mica schist. Here were found fine crystals of pinite, 

 and in quartz veins a few fine specimens of washingtonite. C. 

 The stage road to the Litchfield station on the Naugatuck rail- 

 road, crosses Cedar brook at East Litchfield ; from this point 

 looking south a bold rocky peak is visible rising abruptly from a 

 narrow valley on the right bank of the stream, which can 

 be easily reached by the wagon road running south. From a 

 farm house on the road to the southwest of the peak, a path runs 

 to the northeast through the fields and woods on the south side. 

 About a hundred and fifty rods from this house, in the mica schist 

 which is transversed by large veins of quartz, were found several 

 crystals of staurolite of unusual size, and also masses of iron ore 

 that proved to be portions of very large crystals of washington- 

 ite. One or two blasts brought to view one perfect crystal of 

 washingtonite, imbedded in the quartz, that measured nearly 

 seven inches in its longest diameter. It fell to pieces when an 

 attempt was made to extract it but the whole crystal must have 

 weighed about six pounds. 

 Kyoto, Japan, May 20, 1887. 



10. Analysis of Blue Clay from Farmington, Maine ; by F. C. 

 Robinson (communicated). — The following analysis of clay was 

 made in my laboratory by Mr. W. V. Wentworth, and may be 

 of interest for reference, especially as I found but few such analy- 

 ses recorded when I recently had occasion to look up the subjects 



Si0 2 63-69 



A1 2 3 17-02 



FeO and Fe 2 3 (mostly FeO) 10-18 



CaO -97 



Na 2 4-02 



H 2 4-05 



99-93 



