342 THE CAMBRIAN SERIES IN N.W. CAERNARVONSHIRE. 



brian rocks to that extent, an explanation of which there is elsewhere 

 no confirmation. He referred to sections which he had described 

 on former occasions to prove that the conglomerate of felsite-pebbles 

 and that made up of quartz-pebbles alternated with one another, 

 passed into one another, and behaved similarly along the whole base 

 of what he called Cambrian. 



Prof. BoxNEY said that at that late hour he would not enter upon 

 the wide questions raised by the previous speakers, from whom 

 he differed only on some points of detail, but confine himself to 

 Mr. Blake's remarks. The discrepancy between the text and map in 

 Mr. Blake's paper certainly existed ; and the divergent strikes in 

 the district between the Cae-Seri breccia and the Bryniau conglo- 

 merate showed that no reliance could be placed on strike either way. 

 With respect to the main point, the Bryn-Efail ])it, Mr. Blake had 

 in vain tried to maintain his position. In that pit there was no 

 slate, no chiastolite, no grit older than the felsite, all of which 

 Mr. Blake had asserted to be found there. Ho (the speaker) had seen 

 all Miss Raisin's microscopic sections, had examined them without 

 labels and mixed up with other Welsh specimens, so that lie might 

 be unprejudiced, and had no hesitation in saying that as to this she 

 was quite right, and Mr. Blake hopelessly wrong. 



The President said that, wishing to preserve the impartiality of 

 the Chair, he had refrained from taking part in the discussion, but 

 he thought it only fair to point out that even if the particular 

 section of Bryn Efail were abandoned by Mr. Blake, the main body 

 of his evidence would remain in favour of his contention that in 

 Caernarvonshire there is no proof of any pre-Cambrian rocks. He 

 stated that his own observations had led him to the conclusion that 

 this contention was well founded. 



Mr. Peach also spoke. 



