526 Correspondence — Rev. T. G. Bonney. 



Peof. Owen during a recent visit to Brighton, called on the Mayor, 

 Mr. Alderman Webb, and left a letter for his worship, on the de- 

 sirability of taking steps for forming a collection or series of the 

 Wealden Fossils of Sussex, corresponding, as far as time and means 

 might permit, with the illustrations of the Chalk-beds which the 

 Local Museum owes to the liberality of Mr. Willett. Not having 

 been fortunate to meet with the Mayor, the Professor called on Mr. 

 Cordy Burrowes, to whose active public spirit Brighton is much in- 

 debted. The worthy Alderman, who will probably hold the office 

 of Mayor during the meeting of the British Association, entered 

 warmly into the views of his visitor, and pledged himself to promote 

 their realization to the extent of his influence. 



RIVER TERRACES, ETC. 



giR^ — I certainly did not understand that Colonel Greenwood was 

 speaking solely of terraces in closed valleys. This, it appears to me, 

 was by no means clearly brought out in his first letter. With re- 

 gard to these I can only say that, owing to the general correspondence 

 between all these terraces that I have seen and those in the open 

 valleys, it seems more natural to refer both to the same cause, viz., 

 the action of water in motion upon detritus that has been mainly 

 deposited in water comparatively at rest, and this, if your summary 

 be correct, seems to be Professor Kjerulf's opinion. Doubtless a 

 delta may be elevated by floods, but as a rule the amount thus 

 gained would be small compared with the mass deposited under 

 the permanent water level. I should regard the inland terraces to 

 be remains of deltas, either deposited in fjords during a period of de- 

 pression, or in lakes which have been first more or less filled up, then 

 re-excavated. In order to explain this, I do not think it necessary 

 to hurst any barriers, or call in other agencies to remove them than 

 " rain and rivers " acting upon rocks liable to erosion. In thus 

 venturing to differ from Colonel Greenwood, I would not be thought 

 forgetful of the great services he has rendered to geologists by his 

 careful observation of meteoric agents and their work in nature. 



T. G. Bonney. 



St. John's College, Cambridge. 



ERRATA IN THE PAPER, "ON THE SYSTEMATIC POSITION OF 



SIVATSERIUM GIGANTEUM:' 



giB,^ — In my communication on this subject in the October number 

 of this Journal, I have observed two errors, which I feel it my duty 

 to correct, in justice to the individuals concerned. At page 440, re- 

 ference is made to Dr. Canfield's " concise paper on the manner of 

 shedding and the nature of the Prongbuck's horns." This author has 

 given some account of these, but to Mr. A. D. Bartlett, Superin- 

 tendent of the Zoological Society's Gardens, the honour of the first 

 accurate history is due {vide P.Z.S. 1865, p. 720).^ I might 



1 This substitution of Dr. Canfield's name for that of Mr. Bartlett arose from Di-. 

 Murie having accidentally quoted the wrong year of the Proceedings— namely, 1866, 

 in which Dr. Canfield's {not Mr. Bartlett's) paper is published.— Edit. Geol. Mag. 



