﻿274 The Hon. J. W. Strutt on the Light from the Sky, 



Station. The fact is, the quarries affording this new and beautiful 

 form of the mineral are in the township of Windsor, near, how- 

 ever, the boundary line between this and the township of New- 

 port ; and the name of the latter got to be associated with the 

 quarries from its being that of the railway- station in their imme- 

 diate vicinity, from which the gypsum is despatched to be ship- 

 ped at Windsor. I have lately observed that this locality occa- 

 sionally affords, by the side of the separate needles of Ulexite, 

 the hard form of the same mineral, hardness = 3 (Phil. Mag. 

 January 1868), and that the interior of the hard nodules is some- 

 times very like chalcedony in appearance. Last summer I found 

 a good many specimens of Howlite in gypsum from Newport 

 Station, mostly of the chalky variety ; a few exhibited in an in- 

 ferior degree the pearly scales of the Wink worth nodules; so 

 that the borate is not so rare there as it was thought to be. 



I add a summary of the localities of the borates in this county 

 at present known to me, and the composition and matrix of each 

 mineral. 



Localities of Borates in Hants County, Nova Scotia. 



Borate and Matrix. Localities. 



1. Natroborocalcite (Ulexite, Dana), *) Clifton Quarry, Windsor ; Brook- 



NaO, 2CaO, 5 BO 3 , 15 HO, L J^f ? ^ecothick's Quarry, Three 



f Mile Plains; Wmkworth; New- 

 in gypsum, at j port Station. 



2. Cryptomorphite, 



NaO,3CaO,9B0 3 , 12HO, • I Clifton Quarry* "Windsor. . . 

 in glauber-salt in gypsum, at ] 



3. Silicoborocalcite (Howlite, Dana), 1 Brookville ; Winkworth; New- 



v ' ' <' { port Station; Noel (Chevene 



4 CaO, 2Si0 2 , 5 BO 3 , 5HO, r and Walton reported, but matrix 



in gypsum, at J unknown to me). 



in anhydrite, at Brookville. 



4. Winkworthite, ~] 

 *. llCaO, SiO 2 , 9SO 3 ,3BO 3 ,20HO, I 



/3. llCaO, SiO 2 ,8SO 3 ,4BO 3 ,20HO, r Wmkworth. 

 in gypsum, at J 



XXXVI. On the Light from the Sky, its Polarization and Colour. 

 By thellon. J. W. Strutt, Fellow of Trinity College, Cambridge. 



[Continued from p. 120.] 



IN the February Number of the Philosophical Magazine I 

 have propounded a theory of the scattering of light by par- 

 ticles which are small in all their dimensions compared with the. 



