Prof. Daniel! on a New Oxy-hydrogen Jet. SI 



* relations : he saw particular species of fossils in particular 

 ' groups of strata, and in no others ; and giving generalization 

 ' to phaenomena, which men of less original minds would 

 ' have regarded as merely local, he proved, so early as 1791, 

 4 the continuity of certain groups of strata, by their organic 

 6 remains alone, where the mineral type was wanting. He 

 6 made large collections of fossils ; and the moment an op- 

 ' portunity presented itself, he arranged them all stratigra- 

 6 phically. Having once succeeded in identifying groups of 

 6 strata by means of their fossils, he saw the whole import- 

 6 ance of the inference, — gave it its utmost extension, — seized 

 ' upon it as the master-principle of our science ; — by help of 

 1 it disentangled the structure of a considerable part of Eng- 

 ' land, — and never rested from his labours till the public was 

 ' fairly in possession of his principles. If these be not the 

 ' advances of an original mind, I do not know where we are 

 ' to find them : and I affirm with confidence, after the facts 

 1 already stated, that the Council of the Geological Society 

 1 were justified in the terms of their award ; and that Mr. 



* William Smith was the first in this country to discover and 

 ' to teach the identification of strata, and to determine their 

 1 succession, by means of their imbedded fossils*.' 



X. On a New Oxy-hydrogen Jet. By J. F. Daniell, Esq.F.R.S. 



Prof. Chem. King's College, London. 



To R. Phillips, Esq. $c. $c. 



My Dear Sir, 

 [ SEND you herewith a drawing of a jet for the combus- 

 A tion of any inflammable gas with oxygen, which I have 

 found extremely useful, both in original research, and in com- 

 modiously exhibiting a variety of instructive class experiments. 

 Several of my friends have adopted it at my suggestion, and 

 are equally pleased with it ; and I have in consequence been 

 so often applied to for a description of the arrangement, that, 

 simple as it is, I cannot but think that an account of it may 

 be acceptable to many of the readers of your Journal. The 

 drawing represents it entire, and in section, and of two thirds 

 of the original size: ab is a jet of brass, to be connected, by 

 means of the stop-cock c, and a flexible pipe, with a gas- 

 holder of oxygen gas. This is fixed by means of a screw g 9 



* Address of Mr. Sedgwick, as President of the Geological Society, on 

 awarding the first Wollaston medal to Mr. William Smith. — Proceedings 

 of the Geological Society, 1831, pp. 273, 274.— See Phil. Mag. and 

 Annals, N.S. vol. ix. p. 275. 



Third Series. Vol. 2. No. 7. Jan. 1833. I 



