288 Geological Society : — 



existing between the granitic type, foyaite, and the other mem- 

 bers of the gronp. There are some mountains near Bio de Janeiro 

 composed of these rocks, as is also the peak of Itatiaia, 3000 metres 

 high, the loftiest mountain of eastern South America. A cursory 

 examination of some of these localities having shown an apparent 

 relation between foyaite, phonolite, trachyte and certain types of 

 basalt, Mr. Derby determined to visit the Caldas region, where a 

 railway under construction gave unusual facilities for examining 

 this series. A fine development of foyaite, phonolite and tuff was 

 found, associated with several types that have not yet been met 

 with in the other localities. The existence of a leucite basalt was 

 recognized. 



The bulk of the paper was devoted to a detailed description of these 

 railway-sections, and the following deductions are drawn : — 



1. The substantial identity, as regards mode of occurrence and 

 geological age, of the Caldas phonolites and foyaites. 



2. The connexion of the latter through the phonolites with a 

 typical volcanic series containing both deep-seated and aerial types 

 of deposits. 



3. The equal, if not greater antiquity of the leucite rocks as 

 compared with the nepheline rocks, whether felsitic, as phonolite, or 

 granitic as foyaite. 



4. The probable palaeozoic age of the whole eruptive series. 



2. " Notes on the Metamorphic Rocks of South Devon." By Miss 

 Catherine A. Raisin, B.Sc. 



This communication consisted mainly of detailed observations, 

 supplementary to those published by Prof. Bonney in the Society's 

 Journal for 1884, on the slaty and metamorphic rocks of South 

 Devon in the neighbourhood of Salcombe estuary. In the first part 

 of the paper details were given of the sections exposed around the 

 estuary, at Hope Cave to the westward, and in several localities to 

 the eastward as far as Hall Sands, all confirmative of Professor 

 Bonney's views, and showing that the slaty beds to the northward 

 do not pass into the mica and chlorite schists to the south, but are 

 separated from the latter by a line of faults. 



Descriptions were then given of microscopic slides from various 

 parts of the metamorphic rocks. Some of these showed the action 

 of secondary forces. The effects of lateral pressure in producing 

 cleavage-planes and a kind of jointing were also commented upon. 



An attempt was also made to determine the succession of chlorite-, 

 mica- and micaceo-chloritic schists around Salcombe estuary. The 

 beds appeared to succeed each other in the following order, com- 

 mencing from the northward : — 



1. (a) Interbanded series south of Harwell Wood &c. 



(6) A thick band of chlorite- schist at Scoble and at Snapes 

 Point &c. 



2. (a) Mica-schist north of the side estuary. 



(6) Interbanded series south of the side estuary. 



3. Mica-schist of Portlemouth Ferry. 



4. Chlorite-schist of Bickerton. 



