"Vol. 50.] ANNIVERSARY ADDRESS OF THE PRESIDENT. 6 1 



Greene. To the British occupation of Egypt we likewise owe some 

 ' Notes on the Geology of the Northern Etbai or Eastern Desert of 

 Egypt, with an account of the Emerald Mines,' by Mr. Ernest 

 Floyer. This gentleman enjoyed exceptional advantages in the 

 examination of a highly interesting district, which is difficult of 

 access under ordinary circumstances. His conclusions as to the 

 relations of the crystalline to the sedimentary series are somewhat 

 at variance with those of the majority of previous authors, who 

 have described adjacent districts in Egypt and the Sinaitic peninsula. 

 As regards the matrix of the emerald in these ancient and now 

 abandoned mines, we have the authority of Mr. Rudler that it 

 appears to be a biotite-schist, more or less talcose, the mode of 

 occurrence being somewhat similar to that of the emeralds of 

 Siberia, where the mineral is associated with mica-schist. In 

 ' Notes from the Nile Valley,' by Messrs. Johnson and Richmond, 

 the information concerning the region south of Assouan is of con- 

 siderable interest, though the intrusion of the granite into the 

 sandstone, like a similar statement by Mr. Eloyer, opens up new 

 views as to the geology of these regions. In reference to this and 

 other questions, we have the conclusions of Prof. Hull on the 

 geological features of Arabia Petrsea and Palestine, an outline of 

 which was lately offered to the Society. 



Under the heading ' Miscellaneous Geology ' I would further draw 

 attention to several interesting papers on Metalliferous Deposits — ■ 

 such as a paper by Mr. Attwood on the Auriferous Tracts of Mysore, 

 a paper by the late Mr. Becher on the Gold- quartz Deposits of 

 Pahang, one by Mr. Power on the Pambula Gold Deposits, and two 

 papers by Mr. Collins on the Sudbury Copper Deposits and on the 

 Geology of the Bridgwater District— both localities in Canada. 

 Furthermore, there is a paper by Messrs. Hughes and Bonney on 

 the Obermittweida Conglomerate, one by Mr. Lister on the Geology 

 of the Tonga Islands, and one by Prof. Hull on the Physical Geology 

 of Tennessee. Mr. Cooke tells us about the Marls and Clays of the 

 Maltese Islands, Lieut. Frederick writes of certain islands in the New 

 Hebrides, and finally there is the admirable paper, to which I have 

 already alluded, by Miss Ogilvie on the Geology of the Wengen 

 and St. Cassian Strata. 



Miscellaneous Invertebrate Palceontology. — There are a score of 

 papers which may be thus classified, dealing with siliceous organisms, 

 with corals, crinoidea, bryozoa, ostracoda, and cephalopoda. 



