Vol. 54.] GEOLOGY OF PKANZ JOSEF LAND. 645 



possible to do geological work during only two or three months of 

 the year, and even that time was chiefly taken up with other 

 duties. 



[Since writing the foregoing paper I have visited the island of 

 Skye, and after seeing the conditions of the basaltic formation there, 

 I am convinced that dykes and sills, especially the former, are com- 

 paratively rare in Pranz Josef Land, where indeed I never saw a 

 dyke at all. Some of the basaltic sheets in Pranz Josef Land, how- 

 ever, may possibly be sills, but of this no actual evidence, other than 

 microscopic, is forthcoming. Moreover, nothing that I saw in Skye 

 has led me to change my opinion as to the contemporaneity of the 

 plant-beds with at least the first two or three basalt-flows. — 

 Aug. 26th, 1898.] 



