Feb. 9, 1888] 



JVA TURE 



359 



Table ok Wave-lengths of Auroral Lines. 



Barker 



Smyth 



Zollner 



A. Gierke 



Herschel 



Backhouse 



I.orrl Crawford 



H. F. Proctor 



Vogel 



Ellery 



O. Struve 



Angstrom 



Lemstrom 



German North Polar Expedition 



Respighi 



Peirce 



Probable origin 



Wave-lengths of probable origin 



Duner's bands ... 



482 



485 



more ref. than F 



46o_^474 

 10 



486 



C (cold) 

 483 

 477_48S 



502 



501 



Mg 

 SCO 



517 



5165 



C (hot) 

 516-5 



523 



521 



525 



520 



Mg 

 5201 



495 503 516 521 



S50J45 



7 



616 627 

 2 



564_J59 

 4 



Coronal line. 



t Another jjrobable origin for this in the aurora is 540 Mn. 



This means brightest fluliug. 



Addendum. — The following table shows the above figures 

 a. another form and includes the bright lines recorded in 

 y Cassiopeiae : — 



kological Society, January 25.— Prof. J. W. Judd. 

 LS., President, in the chair. — The following communications 

 read : — On Ailnrus anglictis, a new Carnivore from the 

 Crag, by Prof. W. Boyd Dawkins, F. R. S. The specimen 

 cribed is a small fragment of the right lower jaw with the 

 three molar teeth in position, and belongs to the Crag 

 Ection of the Yorkshire Philosophical Society. It differs in 

 fmarked degree from all fossil European Carnivores, and 

 resents no important points of difference when compared with 

 ^series of jaws of recent ^i7«m^. The author gave a descrip- 

 of the fossil, and comparison of it with Ailurtis fulgens, and 

 a table giving the comparative measurements of the teeth 

 jaws of the fossil and of recent Ailiiri. The species from 

 Crag was a more powerful animal than any recent Ailuri in 

 British Museum. The paper concluded with a notice of the 

 Sge oiAiliirus in space and time. After the reading of this 

 er the President remarked that seldom had a fact of greater 

 rest in its bearing upon geographical distribution in past 

 »s been brought before the Society. Some comments on the 

 ^r were also made by Mr. Lydekker, Prof. Seeley, Mr. 

 ton, and Mr. Blanford.— A contribution to the geology 

 physical geography of the Cape Colony, by Prof. A. H. 



This line is seen as a pretty bright line in the spectrum of the Limerick 

 ante, but its origin has not yet been determined, although comparisons 

 1 been made w.th most of the common elements. So far, it has not been 

 ved in any other meteorite. 



Green, F.R.S.— On two new Lepidotoid Ganoids from the early 

 Mesozoic dejxjsits of Orange Free State, South Africa, by Mr.. 

 A. Smith Woodward. The results presented in Prof. Green's and 

 Mr. Woodward's papers were discussed by the President, Prof. 

 Rupert Jones, Mr. Blanford, Dr. Geikie, Mr. Clement Reid 

 Prof. Hughes, and Mr. Irving. 



Royal Microscopical Society, January 11.— Rev. Dr. 

 Dallinger, F.R.S., President, in the chair.— The President 

 referred to the death of Dr. Arthur Farre, a former President of 

 'the Society, and one of its earliest Fellows. — Prof. C. Stewart 

 exhibited specimens of Tliecalia concatneraia. In this genus 

 the female shell exhibited a peculiarity which was quite unique. 

 As age advanced the mantle became folded back upon itself in 

 a very curious manner, and simultaneously with this there 

 occurred a similar in-folding of the contiguous portions of the 

 shell by which two depressions were produced, forming a fusi- 

 form chamber when the two valves came together. In this 

 cavity the embryonic shells were found. — Edmond's automatic 

 mica stage rotating by clockwork was exhibited and described. 

 — Mr, A. W. Bennett gave a resutni of his paper on fresh- 

 water Algae of the English Lake District, with a description of 

 a new genus of Capsiilococctis and five new species, in continu- 

 ation of his previous communication on the same subject.— Dr. 

 G. Gulliver read a paper on Pelamyxa palustris. The large 

 size of this amoeboid organism had enabled it to be cut into 

 sections, and the granulated structure of its exoplasm thus 

 revealed was described. As regarded its classification, it was 

 thought that ultimately it would be found to have a nearer 

 relationship to the true Heliozoa than to the more lowly 

 Amoebae. — Mr. E. M. Nelson handed round for inspection two 

 photographic positives ; one of Amphipletira pelhicida, and the 

 other of a fungus growth which attacked calcareous sand, as de- 

 scribed by Mr. J. G. Waller in the Journal of the Quekett Micro- 

 scopical Club, i. p. 345. This object presented some photographic 

 difficulty because of its non-actinic colour. With regard to the 

 other he remarked that in resolving diatoms with oblique light 

 it was essential to decide whether they intended to focus upon 

 the real surface or upon the optical image produced in a higher 

 plane, in consequence of the double nature of the structure of 

 the valve. In the latter case they would obtain a result such as 

 he exhibited, which was a photograph of the optical image and 

 not of the real diatom. — Mr. Nelson also called attention to a 

 curious optical effect for which at present he was unable to 

 account. In a flat box he had placed a glass positive of A. 

 pelhuida which was viewed as a transparency through a piece of 

 tube fitted at right angles to the surface. If this was looked at 

 when held towards a surface of light such as an optical lamp- 

 shade or a sunlight gas-burner, the black lines appeared to be 

 slightly smaller than the white lines ; but if it was turned towards 

 a small light at a distance, then the black lines appeared very 



