572 Intelligence and Miscellaneous Articles. 



area is of Silurian or Lower Carboniferous age, and that the most 

 recent are of Triassic or even later age. As all the granites are 

 intrusive iu the most recent beds, it follows that the granites are 

 younger than the Trias. The author gives his reasons for believing 

 that the oldest granite was erupted while the crumpling of the 

 Gilgit rocks was in progress ; but that a portion, at all events, of 

 the younger granites was erupted after the crumpling had taken 

 place. 



The author offers an hypothesis to explain certain structures 

 found in the Gilgit granites, including the granophyric structure so 

 common in them. 



All the Gilgit granites, the author believes, came from the same 

 igneous reservoir, the differences in them being due to gradual and 

 progressive silifi cation caused by the gradual crystallizing-out of the 

 comparatively basic minerals : the process extending over a long 

 period of time measured in years. 



LX. Intelligence and Miscellaneous Articles. 

 To the Editors of the Philosophical Magazine. 



Gentle me y, 



IN" the December number of the Philosophical Magazine for 1891 

 will be found a table of Zonal Spherical Harmonics, published 

 by Professor Perry. Some time ago I had occasion to use these 

 tables and found that in one or two places the values given 

 were erroneous. My work did not involve P 7 , but the test I 

 applied to the others was severe, as is shown by some of the 

 corrections being quite small. I have checked the values I send 

 several times, and Mr. H. F. Skey has also kindly checked them 

 for me. 



I am, &c, 

 Care of Surveyor General, C. C'OLEEIDGE FaKR. 



Wellington, New Zealand, 

 Feb. 23, 1900. 

 Numerical Corrections toProfssor Perry's Table of Zonal 

 Spherical Harmonics. 

 In P. angle 76, for --4112 vead --4132. 

 -•4252 „ --4227. 

 -0650 „ --0651. 

 + •0038 „ --0038. 

 + •8476 „ +-8492. 

 + •1347 „ +-1353. 

 - -2053 „ - : 2040. 

 -•0645 „ --0665. 

 + •2996 ., +-2997. 

 + •2605 „ +-2606. 

 + •1786 ,. +-1791. 

 + •1144 ,. +-1136. 

 -•0284 „ — -0290. 

 -•2811 „ --2810. 



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47 



p< 



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68 



p< 



55 



70 



p fi 



55 



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r„ 



, ? 



19 



?r 





25 



Pr 





47 



P r 



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66 



Pp 





68 



P. 



55 



71 



P P 



55 



73 



P. 

 Pi 



55 

 55 



77 

 86 



