748 Intelligence and Miscellaneous Articles. 



terraces of Barbados were examined chemically and microscopically,, 

 in order to ascertain the composition, nature, and origin of their 

 extraneous mineral contents. A special method was used, whereby 

 the extraneous mineral matters were separated, practically with- 

 out alteration, from large quantities of the limestones. Chemical 

 analyses of the residua were made, and the results of these and of 

 the microscopical examinations are tabulated in the paper. The 

 extraneous minerals present were found to be apparently-fresh and 

 largely-unaltered fragments of wind-borne volcanic minerals 

 and glass. It was found that the volcanic minerals enclosed in 

 the reef -corals on which they fell have been protected from change ; 

 those in the clastic limestone or bed-rock show signs of detrition 

 and weathering prior to the consolidation of the limestone. 

 Similar minerals separated from clay normally formed and 

 accumulated in a pothole in the limestone supply evidence of 

 weathering changes after being set free from the rock. It is 

 shown that the composition of the sedentary residual soils on the 

 higher limestone-terraces of Barbados corresponds in its essential 

 parts with the residua separated, either naturally or artificially, from 

 the limestone. 



The proportions of magnesium carbonate present in the coral- 

 rock are briefly discussed, and complete analyses of the high-level 

 and the low-level limestones are given. A note on the proportions 

 of titanium oxide in the Barbados Oceanic clays and in some of 

 the Challenger and Buccaneer deep-sea dredgings is appended to> 

 the paper. 



LXXX. Intelligence and Miscellaneous Articles. 

 ON A NEW FORM OF CATENARY. 



To the Editors of the Philosophical Magazine. 

 Deah Sirs, — 



MAY I be permitted through you to express to Mr. McLeod 

 my sincere apologies for having unintentionally published 

 my paper " On a New Eorm of Catenary " when the subject had 

 already been dealt with by him. 



I was requested to undertake the investigation during the 

 summer of 1917, and a summary or! it was incorporated in a 

 monthly report of the R.N.A.S. Establishment, Cranwell, early in 

 1918. 



This was a highly confidential document and was never published ; 

 and since then the paper has been lying by awaiting permission 

 for open publication, which was only granted this summer. 



I may add that I was quite unaware of Mr. McLeod's work 

 until I read his letter in your November issue. 



Yours faithfully, 

 College of Technology, J. HoLLltfGWOETH. 



Manchester, 

 Nov. 10th, 1919. 



