Some Igneous Rocks in Down and Antrim. 57 



qualities of building stones, and in this connection the following 

 quotation from a letter just received from the eminent geologist 

 Professor Judd, is of much interest. " Microscopic sections" 

 Professor Judd writes, ii are not infrequently employed to dis- 

 criminate between the hardness and durability of different 

 kinds of building materials, and of other rocks used for 

 economic purposes. 



There are two kinds of observations that can be made, 1st, 

 as to the nature of the cement between the grains of a rock ; 

 2nd, as to the amount of incipient decomposition the particles 

 of a rock have undergone." 



I have only now, in conclusion, to add — we are all justly 

 proud of our coast scenery, do not let quarrying operations 

 mar its beauty nor accelerate its erosion. On the other hand, 

 geology may be largely aided by quarrying, and may we not 

 hope that, especially in the inland rhyolite districts, further 

 sections, as interesting as the classic section at Templepatrick, 

 may yet be revealed. 



Note on some Experiments on Irish Stone for Street 

 Paving by H. Gullan. 



Mr. H. Gullan, Superintendent of Works to the Corporation, 

 referring to the use of Irish stone for street paving, informed 

 the members present that the Works Department were about 

 to lay down a series of lengths of sett paving in Corporation 

 Street with stone from several Irish quarries, with a view of 

 testing the quality of the various stone for the purpose of 

 street paving. He also mentioned that a similar experiment 



