334 Transactions. — Geology. 



closely resembles a letter S ; and it will be admitted that, 

 could we take up a slice sufficiently thick, and thus bare to our 

 view this valley at an earlier time, before it had been so much 

 filled up as to-day, we should find this river equally meander- 

 ing, only that it would have to be described by opposite curves 

 to the letter S of to-day ; and in the intermediate depths the 

 same large waterflow wovild be observable, and thus explain 

 to us the meaning of the following extract from the Otago 

 Daily Times' s (27th April) mining intelligence from the Arrow : 

 " The gold was found in the stuff taken out in the operations 

 of boring, and several layers of wash were passed through, all 

 showing more or less gold. The bore-hole is now down up- 

 wards of 100ft. without striking the bed-rock. The prospects 

 of the field are better than ever before." The bands of wash- 

 dirt, of course, indicate to us the larger water-sorting of the 

 then course of the river. 



I must apologize for the brevity and incompleteness of this 

 paper, as I have had no opportunity for travelling for some 

 few years, and beg you will find an excuse for me ; but if I 

 have succeeded in drawing attention to this subject, that 

 others who dwell in districts more favourable for observation 

 than Dunedin may profit by it, I shall be content. I need 

 hardly say that all valleys are filled up in the way indicated 

 by the foregoing remarks. 



Of the photographs I now exhibit No. 1 is of the Mount 

 Burster Claim, showing the bands I have alluded to ; No. 2 is 

 of the Miiller Glacier, and brings under our notice the debris 

 it is carrying, also a,t its foot exhibits the water flowing. The 

 glacier is melting on its surface exposed to the rays of the 

 sun, and thus causes the stones with which it is charged to 

 become more apparent than its normal condition would be 

 when nearer the pole. 



Art. XXXIX.— A^'o/c on Boch collected by the Rev. W. S. 

 Green from near the Summit of Mount Cook. 



By Professor T. G. Bonney, F.E.S. 



Communicated by Professor F. W. Hutton. 



[liead before the Wellington Philosophical Society, 9th January, 1889.'] 



Under the microscope this rock is found to be composed of 

 — (1) angular fragments of rather clear quartz, commonly less 

 than O'lin. in diameter, but occasionally as large as 0-15in. : 

 (2) rather earthy-looking fragments of about the same size, 

 which on examination with a high power are found to be crowded 

 with filmy microliths, often faintly tinged with green, giving 



