17 



to vou if you wish. I hope you may be able to find more 

 specimens of it. The large white orthoclasses are very 



conspicuous." 



In the introduction to the " Ingleby Greenhow Register," he 

 says, in speaking of Glacial Boulders "we have measured and 

 taken notes of some hundreds occurring within the limits of the 

 parish. A collection made by us of specimens of different 

 varieties has been examined by Professor Bonney, and by Mr. 

 C T Clou°h, of the Geological Survey, as well as by ourselves. 

 These specimens afford evidence of a stream of erratics flowing 

 into our locality from the South of Scotland, and from the Lake 

 District of Cumberland and Westmoreland. Local rocks, such 

 as the sandstones of the Inferior Oolite, and blocks, of Augite- 

 andesite from the Cleveland Whinstone Dyke are of course, 

 numerous. Next to these in point of number come Porphyrias 

 from the Lower Old Red District of the Cheviot Hills, lhe 

 varieties also include Shap Granite, Criffel Granite, Syenite, 

 Dolorite, Greenstones from Borrowdale, Volcanic Ash from 

 Cheviots, Porphyritic Felsite, Igneous Felstone, Igneous Rock 

 probably from near Loch Lomond, Old Red Trap, supposed to be 

 from near Kelso, Porphyritic Basalt from Carter Fell . Whinsill 

 from Upper Teesdale, Quartzite Greywacke, Hiilleflmta, Mud- 

 stone, Coniston Flagstone, Carboniferous Limestone, Carboni- 

 ferous Sandstone, Magnesian Limestone, Old Red Conglomerate, 

 Mill-tone Grit, Vein Quartz, (See Fifteenth and Sixteenth Reports 

 of the British Association Committee for recording the position, 

 etc., of the Erratic Blocks of England, Wales and Ireland). On 

 one occasion Mr. Hawell found Asbestos in the Whin Sill at Great 

 Ayton In 1903 he wrote a most interesting letter on the Sun and 

 Glaciation. "Thank you so much for the cutting from the 

 Standard." I think that if it is possible to suppose that the sun 

 may be a variable star we have the very simplest of explanations ot 

 the cause of glacial epochs. All the other explanations have 

 presented difficulties to me, and it has been the fashion in the 

 past for geologists to assume that the sun has gradually cooled. 

 Still Astronomers, and even geologists have not been altogether 

 unmindful of the possibility of there being some variability. 1 

 find for example, in Geikie's Text Book of Geology (Edition 

 1883) a quotation from Prof. Tait in which he suggested that 

 " the former greater heat of the sun may have raised such vast 

 clouds of absorbing vapour round that luminary as to prevent 

 the effective amount of radiation of heat to the earth's surface 

 from beiii" greater than at present." A similar cause may. 1 

 think have made it even much less. But I do not remember to 



