Intelligence and Miscellaneous Articles. 315 



2. The Boulder Beds are next described, their distribution noted, 

 and their occurrence with aeolian deposits recorded. The author 

 argues that the aeolian deposits once had a greater slope, and acted 

 as carriers, so that, under the influence of rain, the stones from the 

 hills slipped to their present position. 



3. The Quartzite Reefs are described as filling up cracks ; the 

 material is of aeolian origin and derived from the surrounding rocks, 

 and owing to this material having been formerly at a lower level 

 than the latter, water stood on it for a sufficiently long time to 

 permit of the materials being cemented by a siliceous deposit, and 

 converted into quartzite. 



4. The Infratrappean Grits are maintained to be superficial deposits 

 on the pre-trappean land-surface, some being the ordinary results 

 of weathering, others due to the washing down of debris to a water- 

 covered level, and others again simply aeolian drift. It is thus seen 

 that there has been constancy in the meteorological conditions of 

 Cutch from recent times as far back as the Cretaceous period. 



5. The Laterite-deposits of the district occur to a height of only 

 120 feet above the Rann. There is evidence that they were laid down 

 in water at a time when the surface of the country was not very 

 different from the present one. The material may have been partly 

 derived from Jurassic rocks, but some of the constituents, as the 

 eroded agates, must have come from the trap-rocks. 



6. The Kann is an area which has recently been abandoned by 

 the sea, owing to unequal movements, but there is evidence that 

 deposit has also taken place in it, and the depression has become 

 shallower, so that in course of time the whole surface will be made 

 of alluvial or aeolian soil. 



XLIV. Intelligence and Miscellaneous Articles, 



GALVANOMETER DESIGN. 

 To the Editors of the Philosophical Magazine. 



GENTLEMEN", 



T3EEMIT me to acknowledge the courtesy and entire correct- 

 J- ness of Professor Gray's recent letter (Phil. Mag. January 

 1897) respecting my note on Galvanometer Design (Phil. Mag. 

 December 1895). Professor Gray perfectly apprehends my point 

 of view in the matter, and very' clearly indicates the nature of 

 the omission which constitutes my error. That this was its 

 nature I had already discovered in reflecting upon the note by 

 Professors Ayrton and Mather (Phil. Mag. November 1896). It 

 had been my intention to briefly point out the fact as soon as 

 some additional experimental data could be obtained. But as this 

 would probably cause some further delay, owing to my inability to 

 participate in active work, I take the opportunity afforded by 

 Professor Gray's remarks to recognize the correctness of the 



