1912-1913-] An Account of the Excursions (1913). 49 



author of ' The Book of the Winter Garden,' and a contributor 

 to the work on ' Trees and Shrubs.' Up to his last illness 

 he was busy writing a book on ' The Cultivation of Egyptian 

 Plants,' but unfortunately only one part is published. Mr 

 Fish was a specialist in orchids, of which he had a large 

 collection of dried specimens. 



AN ACCOUNT OF THE EXCURSIONS (1913). 



By The President. 



The first field meeting this season — April 26 — was a geological 

 one to North Berwick, under the leadership of Mr T. C. Day. 

 Owing to the unfavourable condition of the weather, only 

 fifteen members were present. The party were shown first 

 a small intrusive boss, called the Yellow Craig, on the shore. 

 The rock is termed an analcite basalt. It is one of many 

 intrusive bosses and silts connected with the volcanic centre, 

 but later than the lavas and ashes with which they are 

 intruded. The intrusive nature of this small boss, the leader 

 pointed out, was indicated by the intense contact-hardening 

 of the sediments in which it is found. Blocks of the detached 

 sedimentary rocks are seen well inside the basalt, and partly 

 dissolved by it just before cooling took place. The extensive 

 beds of volcanic ash carrying numerous fragments and blocks, 

 some of very large size, were next examined. It was once 

 supposed that these large blocks imbedded in the ash indi- 

 cated the proximity of a volcanic neck, and that they were 

 blown into their present position. It is now suggested, how- 

 ever, that it is more likely they were carried by mud- 

 streams and gently deposited where they are at present found. 

 Several of these large blocks were examined, and in most it 

 was seen that the strata (stratified ash) below the blocks were 

 but slightly, if at all, disturbed, — a circumstance which appears 

 to favour the latter theory. " The Yellow Man," a curious 

 branching dyke of igneous rock cutting the volcanic ash, and 



VOL. VII. D 



