O34 Correspondence—A. Wade. 
CORRESPONDENCE. 
THE IGNEOUS ROCKS OF THE NORTHERN END OF THE RED SEA. 
Sir,—During the year 1909 I paid two visits to the north end of 
the Red Sea. During these visits I made a careful examination 
of the igneous rock-masses forming a large portion of the Island of 
Shadwan and the hill ranges of Jebel Ksh, Jebel Um Dirra, and 
Jebel Zeit on the mainland. It is my intention to describe these 
rocks in a future paper, and to deal with their relations to one another. 
The rocks consist chiefly of soda-granites, quartz-felsites, diorites, and 
intrusive dolerites. The granites are occasionally gneissose, and in 
such case they are usually accompanied by schists, as on the Island 
of Shadwan. At other times they merge into the most perfect 
eranophyres of a very acid nature. The relations of these rocks to 
one another, and to the overlying sedimentary rocks, present problems 
of more than ordinary interest in the study of the geology of this part 
of Egypt. 
ArtuuR WADE. 
IMPERIAL COLLEGE OF SCIENCE AND ‘TECHNOLOGY, 
Rovat Cotuzce or Science, 8. Kenstncron, 8.W. 
June 8, 1910. 
THE PITFALLS FOR ELEPHANTS IN AFRICA: IN REFERENCE TO 
DEWLISH. 
Srr,—It will be remembered that the Rev. Osmond Fisher, F.G.S., 
at the Geological Society in 19047 read an interesting paper on the 
possibility of the remains of 2. meridionalis found at Dewlish having 
been snared in a pitfall. Apropos of the narrowness of the trench 
Mr. A. B. Lloyd has some remarks which may possibly be of interest 
in connexion with the subject.? ‘(On 15th (July, 1903] 1... 
camped at Kajura, and at this place had my first adventure . . . My 
nose in the air and my ears set to catch the slightest sound, while 
I strained every muscle to push myself forward through the thicket, 
when there was a sudden airy feeling underneath, and the next 
moment I found myself jammed hard and fast in a regular death-trap 
set for antelope. It was a pit about 2 feet wide at the top but 
narrowing at the bottom to a few inches, the total depth being over 
10 feet . . . These holes are dug by the natives in all the game 
country, and the mouth of the pit is usually very skilfully covered 
over with a layer of thin twigs and grass... I have seen them 
specially made for elephant.” 
R. Asptneton Burren. 
Hitpen Manor, TonsprivGe. 
June 17, 1910. 
1 Q.J.G.S., February, 1905, vol. Ixi, p. 38. 
2 A. B. Lloyd, Uganda to Khartown, pp. 96, 97, 98. 
