Edward T. Hardman — On Hcematife in Tyrone. 395 



legend of tke reduced map, as published by the Geological Society, 

 these latter names were altered so as to read " Loicer Silurian [Pro- 

 tozoicy and " Upper Silurian." These changes, in conformity with 

 the nomenclature of Murchison, were, it is unnecessary to say, made 

 without the knowledge of Sedgwick, who did not inspect the reduced 

 and altered map until it was appealed to as an evidence that he had 

 abandoned his former ground, and had recogTiized the equivalency 

 of the whole of his Cambrian with the Lower Silurian of Murchison. 

 The reader will sympathize with the indignation with which Sedg- 

 wick declares that his map was "most unwarrantably tampered 

 with," and will, moi^eover, learn with surprise, that an inspection of 

 the proof-sheets of Warburton's abstract of Sedgwick's paper was 

 refused him, notwithstanding his repeated solicitations. The story 

 of all this, and finally of the refusal to print in the pages of the 

 Greological Journal the reclamations of the venerable and aggrieved 

 author, make altogether a painful chapter, which will be found in 

 the Philos. Magazine for 1854 (iv., vol. viii. pp. 301-317, 359-370, 

 and 483-506), and more fully in the Synopsis of British Paleozoic 

 Eocks, which forms the introduction to McCoy's British Paleozoic 

 Fossils. (See also Preface to Salter's Catalogue, just published, 1873.) 

 In connexion with this history, it may be mentioned that in 

 March, 1845, Sedgwick presented to the Geological Society a 

 paper on the Comparative Classification of the Fossiliferous 

 Eocks of North Wales and those of Cumberland, Westmore- 

 land, and Lancashire ; which appears also in abstract in the 

 same volume of the Geological Journal that contains the abstract 

 of the essay and the map just referred to. (vol. i. p. 442.) That this 

 abstract also is made by another than the author is evident from 

 such an expression as "the author's opinion seems to be grounded 

 on the following facts," etc. (p. 448), and from the manner in which 

 the terms Lower and Upper Silurian are applied to certain fossil- 

 iferous rocks in Cumberland. Yet the words of this abstract are 

 quoted with emphasis in Siluria (1st ed., p. 147) as if they were 

 Sedgwick's own language recognizing Murchison's Silurian nomen- 

 clature. 



( To be continued in our next number.) 



II. — On the Oooureenoe of Siliceous Nodular Brown Haematite 

 (Gothite), in the Carboniferous Limestone Beds near Cooks- 

 town, Co. Tyrone ; and Note on its Formation by Chemical 

 Alteration from Ordinary Clay- ironstone. With Analysis.' 



By Edward T. Hakdman, F.R.G.S.I. ; of tte Geological Survey of Ireland ; 

 Associate of the Eoyal College of Science, Dublin. 



THE ore which is the subject of this paper occurs in rather an 

 uncommon manner ; its existence, however, has been known 

 for a very considerable period, and it is said to have been worked at 

 least 250 years ago. I believe it is this that is referred to in Dr. 

 Boate's quaint work, "Ireland's Naturell History,"^ as being found "by 



, ^ Eead before the Royal Geological Society of Ireland, May 14th, 1873. 

 2 Published in 1652. 



