XXIX. 



tains inclusions of a different kind, which seem to be the 

 result of an abnormal arrangement of the minerals constituting 

 the granite itself. In respect to the specimen exhibited which 

 was obtained from the massive granite boss situated on the 

 east bank of the River Murray, about four miles north from 

 Mannum, one may observe a dark circular area of three inches 

 in diameter, which might, on a cursory inspection, be taken for 

 a section of a more or less globose imbedded fragment of 

 another rock, so strongly does the dark interior contrast with 

 the exterior red of the granite. But on closer view the interior 

 is found to be only much finer in the grain than the enclosing 

 granite, whilst the darker colour is accounted for by the larger 

 proportion of black mica. So far as his observatians extend, 

 granites having inclusions of the first kind are obviously 

 eruptive, whilst those containing inclusions of the second kind 

 are metamorpMc. 



The following communication was read : — 



I. "On the Bay of Biscay Country," by Mr. J. G. Otto 

 Tepper, E.L.S., Corr. Memb. (See p. 91). 



A short discussion ensued, and Mr. Smeaton gave an illus- 

 tration of Mr. Tepper's theory by diagram drawn on the black- 

 board. 



Professor Tate mentioned that the Rev. J. E. T. "Woods 

 formerly held the opinion that the Bay of Biscay country might 

 be attributed to gaseous exhalations. 



Mr. Scoular supported that theory. 



Mr. Smeatois' remarked that at the time Mr. "Woods pro- 

 mulgated the gaseous theory he was only acquainted with the 

 South-Eastern country, and believed the Bay of Biscay country 

 only occurred in country subject to inundation. He was not 

 aware that similar curious formations- were to be seen in the 

 North. 



Mr. Smeatoin" said he agreed with Mr. Tepper in part of his 

 theory, but not in respect to his view of the original formation 

 beino; connected with mud flats. 



Ordinary Meeting-, July. 6, 1880. 

 Professor Ralph Tate, E.Gt.S., President, in the Chair. 

 The list of donations to the Library was read. 



NOTES AND EXHIBITS. 



Specimens of fresh-water shells from Central Australia, by 

 Mr. Chandler. 



A snake of about nine inches, marked by alternate bands of 

 orange and black, said to have been taken at W r allaroo. bv 

 Prof. Tate. 



