44 Correspondence. 



feet in thickness. Above this occurs a band, six inches to one foot 

 in thickness, of nummulitic limestone in loose slabs. Again, above 

 this occurs (6) a mass of flints, packed together, in layers of from 

 one and a-half to two feet in thickness. This is covered by (a) a 

 recent silt deposit (alluvium) of the river, exactly similar to what 

 lies over the whole of Scinde. In the deposit (6) at the point (d), 

 the flint-cores were found, four feet beneath the surface, and 20 feet 

 below the dotted line (1), the level of the highest flood : (2) is the 

 line of lowest flood level. 



I enclose a seecimen of the limestone,^ and also some granular 

 bodies, found with the flint-cores.^ 



My Son is sending home several more examples of flints from this 

 deposit. — I remain. Sir, yours faithfully, 



Geokge Twemlow, Major General. 

 PoYiE Lodge, Guildford, 1866. 



THE BRITISH ASSOCIATION AND THE NATURAL HISTORY FIELD- 

 CLUBS AND GEOLOGICAL SOCIETIES. 



To the Editor of the Geological Magazine. 



SiK, — I wish to call the attention of your readers to a rather 

 important subject. How is it that the authorities of some of our 

 Field-Clubs fix their meetings for the week of the British Associa- 

 tion meeting ? It can hardly be intentionally done ; but common 

 sense would dictate, that when such a mistake has been made, it 

 should be rectified as soon as discovered by altering the day. Now 

 both the Malvern and the Woolhope Clubs held their meetings this 

 year during the British Association week, to the annoyance of those 

 members who wished to enjoy both. What most surprises me, how- 

 ever, is, that my friend the able President of the Malvern Club, who 

 is such an enthusiastic man of science, should have made such a 

 " faux pas." 



I trust you will insert this in order to guard against similar care- 

 lessness next year. — I remain. Sir, your constant reader, 



LXJDLOW, 19th Nov., 1866. EOBEKT LiGHTBODT. 



nvvCzsczEXiXi^A^isrEOTJS. 



Professor Sedgwick, the occupant for nearly fifty years of the 

 chair of Geology at Cambridge, in commencing his annual course of 

 lectures,' stated that he should not be able to deliver his lecture on 

 the following Friday, having to meet his oculist, his sight being very 

 much impaired ; nor was it, he said, surprising, that one so far 

 advanced in life should be infirm, for this, if it pleased God to spare 

 him to complete it, would be the forty-ninth course of lectures 

 which he had delivered as Woodwardian Professor. Eeviewing the 

 history of his professorship, founded in 173i, he said that practically 



1 The Limestone is true Nummulitic Limestone full of N. laevigata. — Ed. 



2 The granular bodies are pisolitic grains of Iron-ore. They have since been pre- 

 sented to the British Museum. — Ed. 



3 October 21st, 1866. 



