68 



Notes and Commenis. 



vesicles in these pillow-lavas and those in the broken-open 

 slag-blocks of which the great Tees Breakwater was built. 

 These blocks were obtained from the blast-furnaces, the slag 

 running into small box-shaped iron trucks. In ordinary prac- 

 tice these trucks were emptied so soon as they were filled, and 

 while the bulk of the slag was still molten ; but when wanted for 

 the break-water some had to stand for several hours, until a 

 sufficient number of truckfuls had been obtained to make up a 

 train, which was then taken by an engine to the end of the break- 

 water. In this way, the whole of the slag in some of the trucks 

 became completely solidified. When broken open they proved 

 to be vesicular throughout, the vesicles being arranged roughly 

 parallel to the outer walls of the block, just as the vesicles were 

 parallel to the outer wall of the pillows in the lavas ; and, 

 further, the central part of the slag- blocks was the most coarsely 

 vesicular — in fact, almost hollow. When broken up by the 

 rea, fragments of this slag floated away, some even to the 

 shores of Holland. 



YORKSHIRE GEOLOGY. 



The ' Proceedings of the Yorkshire Geological Society/ xvi (2}^ 

 1907 [correctly January 1908], is, with the exception of Messrs, 

 Sheppard and Stather's paper on the Glacial Drift of Holderness, 

 severely Carboniferous in tone. Perhaps the most generally 

 interesting of this series of interesting papers is Hind's note on 

 the dendroid Graptolites from the Pendleside Series. The 

 screen-process reproductions of excellent photographs which 

 illustrate the various papers leave little to be desired.* We wish 

 the Council of the Society which issues this valuable publication 

 would order the date of publication to be printed on the cover 

 of the separate parts, for it seems extremely unlikely that the 

 date 1907 is a correct one for this part. This is an old grievance, 

 and most unfair to authors, especially to one like Dr. Hind, the 

 priority of whose new specific names may at any time be called 

 in question. The proper method of dating serial publications- , 

 can be seen on the covers of the Quarterly Journal of the Geolo- 

 gical Society, or the Proceedings of the Geological Association 

 (London), and there is no editorial difficulty whatever attending 

 such a course. 



THE PAL^ONTOGRAPHICAL SOCIETY. 



The Palaeontographical Society's Volume for 1907 'Aas 

 issued on the 30th December, 1907, and contains the follow- 

 * One of these we are kindly permitted to reproduce (plate x.).. 



Naturaltot, 



