192 Obituary — Jeremidli Sladc, F.G.8. 



and the proper use of sieves of various meslies may be necessary 

 before panning. The method is rapid, gives reliable quantitative- 

 results, and deals with larger quantities than are convenient by more- 

 refined means. 



Pan concentrates derived from any given crystalline rook become- 

 readily recognizable after a short time, and in forested country, where 

 little or no rock is visible, afford a valuable guide in rough mappings 

 That, at least, is my experience iu Southern Nigeria. 



Calabak, W.C.A. John Parkinson. 



Januarij, 190o. 



JEREMIAH SLADE, F.G.S. 

 Born July 19, 1828. Died March 9, 1905. 



It is with much regret that we record the death, at the age of 76, 

 of Mr. J. Slade. Although not known to scientific workers by- 

 published researches he had for half a century been a strenuous 

 teacher and a helper to others. Brought up to the business of 

 a coachbuilder in St. John Street Eoad, London, he was enabled 

 comparatively early in life to retire, and devote his whole attention 

 to natural history. While resident in the north of London he waa 

 a supporter of the once flourishing Literary and Philosophical 

 Institution in Islington, and a frequent attendant at Dr. Bowerbank's 

 " Monday Evenings at home " in Highbury Grove. He was early 

 connected with the Working Men's College in Great Ormond Street, 

 and it was at that institution in 1858 that the formation of the 

 Geologists' Association was first discussed. Among those who took 

 part in the provisional committee and who became founders of the 

 Association were the Rev. T. Wiltshire, Mr. George Potter, Mr. Toulmin 

 Smith, Mr. E. Cresy, Mr. W. Hislop, Mr. J. E. Wakefield, Mr. G. S. 

 Penson, and Mr. J. Slade. In 1866 Mr. Slade assisted in the 

 formation of the North London Naturalists' Club, the earliest field - 

 club devoted to the study of natural history in the neighbourhood 

 of London, and of which he was chosen Secretary. For twenty 

 years (1865-85) he was a teacher of geology, mineralogy, zoology, 

 and botany at the Working Men's College, the Birkbeck Institution, 

 and the City of London College. During this period, froml870 tol875, 

 he studied at the Royal School of Mines. He was an active member 

 of the Quekett Microscopical Club, and he became a Fellow of the 

 Geological Society in 1874. A constant attendant at the excursions 

 of the Geologists' Association, his extensive and accurate information 

 on many subjects, and his knowledge of plants especially, were ever 

 cheerfully and unostentatiously coniuiunicated to inquiring students. 

 The only printed paper contributed by him to the Association 

 was entitled "Notes on the Microscopic Structure of the Basalt 

 of Swallow Cliff and Uphill" (Proc. Geol. Assoc, vol. vii, 1881, 

 pp. 112, 113). His services to science are not recorded on paper, 

 but they have borne good fruit and will long be remembered by 

 a circle of friends whose love of Nature has been inspired and 

 cultivated by his disinterested labours. H. B. W. 



