Caution in Geology. 281 



possible, we brought away a good sample of the clay. 

 Tenally brickfield is on the south side of the Mull. 

 From this we crossed to Port Logan Bay on the north 

 side, where we examined several clay cliffs along the 

 shore containing fragments of shells. From these 

 too we brought away goodly samples. This con- 

 cluded our post-tertiary work. We had resolved to 

 try the loch on Friday, if the weather would permit 

 of it at all. Friday was both wet and stormy, but we 

 were fortunate in getting both a good boat and a 

 good seaman, and although the wind and rain made 

 the work difficult and disagreeable, we got a few 

 good hauls from different localities. But had the 

 weather been favourable, I would have had material 

 from many different points. However, we were glad 

 of the progress that was made. We wished to have 

 had a few hours' shore work in the Bay of Glen Luce, 

 but the tides did not suit. 



" We left Stranraer on Saturday at 2.30, by railway, 

 and reached home by 10 p.m. 



" In regard to the things you had from Crosskey 

 from what is called the ' Middle Glacial Beds/ Ipswich- 

 road, Norwich from their singular appearance I would 

 be quite suspicious of them, unless the locality and 

 the exact position of the bed were given by undoubted 

 authority. A wrong hitch of that kind would be great 

 damage to the whole work. You remember the clay 

 that was sent me from Eastbourne as the common 

 brick clay, which from closer inquiry was found to be 

 mixed with material from borings that had passed 

 through the ' Gault,' and, for anything that has been 

 shown, there may be something of the same kind 



