Intelligence and Miscellaneous Articles. 499 



occur in the jSTaparima district, and, if so, are they connected with the 

 Radiolarian marls or are they part of a separate formation? (3) What 

 is the relation between the San Fernando Beds and the other groups ? 

 Mr. Guppy and Prof. Harrison agree in answering the first part of 

 the second question in the affirmative, and in stating that the two 

 marls are closely connected together. 



In the second part of the paper, Prof. Harrison tabulates the 

 following succession in the Naparima district : — 



3. Eadiolarian beds resembling those of Barbados, "J 



2. Grey Globigerina-ma,rls, the same as those of the L Oceanic Series. 



coast-section. J 



1. Red and blue clays. Nariva Beds. 



Although junctions of the Nariva Beds and the Oceanic Series are 

 not seen, at Ste. Madeleine Usine the clays of the former series 

 occur 30 feet lower than the Globigerina-m&rls, and there appears 

 to be no transition between the two series. On the other hand, the 

 transition between (2) and (3) appears to be complete. A comparison 

 with the corresponding beds at Barbados now becomes possible, and 

 this shows that the Globigerina-m&rls occupy the place of the basal 

 chalks of Barbados, but are much thicker, while the radiolarian 

 rocks are thinner, and the interbedded volcanic ashes so frequent 

 in Barbados are wanting in Trinidad. Chemical and microscopic 

 analyses of the GJobigerina and radiolarian beds are given, and, 

 compared with similar analyses of the Barbadian deposits, they 

 show that more quartz and argillaceous matter occur in Trinidad. 

 The radiolarian marls contain iridescent scales due to fragments of 

 the frustules of the diatom Ethmodiscus, which is ' quite characteristic 

 of some of the deepest tropical red clays and radiolarian oozes 

 far from land.' The ' argiline ' beds appear to be formed from the 

 alteration of the lower Globigerina-maxh. The following correlation 

 is proposed : — 



Trinidad. 



Barbados. 



Coral Rocks. 

 Bissex Beds. 

 Oceanic Beds 



Scotland Beds. {gg£ 



Moruga Series. 

 Naparima Marls. 



San Fernando Beds. 



Nariva Series. 



/Pleistocene & 

 \ Pliocene. 

 Miocene. 



fOligocene 

 I Boc 



Eocene. 



The Oligocene and Eocene Beds are of shallow-water origin 

 and seem to be unconformably covered by the Naparima Marls. 



XL VII. Intelligence and Miscellaneous Articles. 



A FIVE-CELL QUADRANT ELECTROMETER. BY PROF. H. HAGA. 



~pHOF. H. HAGA describes a five-cell quadrant electrometer 

 -*- which has been constructed according to his design in the Phy- 

 sical Laboratory of the University of G-roningheii. A special feature 



