Feb. 27, 1879] 



NATURE 



CXXXIU 



DIARY OF SOCIETIES. 

 London 



THURSDAY, February 27. 

 RoYAl SociBTY, at 8.30. — Studies in Acoustics. I. On the Synthetic 



Examination of Vowel Sounds : W. H. Preece and Aug. Stroh. 

 Royal Institution, at 3. — Sound: Prof. Tyndall. 

 London Institution, at 7. — The Age of Dragons: B. Waterhouse 



Hawkins. 



FRIDA Y, February 28. 

 Royal iNSTiTtrriON, at 9.— The Sorting Demon of Maxwell: Sir W. 



Thomson. 

 QoKKKTT Microscopical Club, at 8.-^0n a Mode of Displaying Objects 



by the Microscope, Irrespective of their Size (the Micro-megascope) : Dr. 



Matthews, F.R.M.S.— The Rotifers by Dark Field Illuminatioa, Illus- 

 trated by Transparencies : Dr. C. T. Hudson, M.A., F.R.M.S. 

 RoYAi. College OF Surgeon's, at 4. — Evolution of the Vertebrata: Prof. 



Parker. 



SATURDAY, March i. 

 Royal Institution, at 3 — Lessing : R. W. Macan. 



SUNDAY, March 2. 

 Sunday Lecture Society, at 4.— Sabbath Superstitions : R. A. Proctor. 



MONDAY, March 3. 

 Royal College of Surgeons, at 4. — Evolution of the Vertebrata: Prof. 



Parker. 

 London Institution, at 5. — The Moral Lessons of Physiology: Dr. 



Fothergill. 

 Society of Arts, at 8.— Dwelling Houses: Dr. W. H. Corfield. 

 Victoria Institute, at 8. — The Antiquity of Man: Prof. Hughes. 



TUESDAY, March 4. 

 Zoological Society, at 8.3o.--ListedesOiseauxrecueillisauNorddu Per u 



par M. M. Stolzmann et Jelski, en 1878: L. Taczanowski. — i)n some 



Collections of Birds from Kina-Balu Mountain, in North-Westem Borneo: 



R. Bowdler Sharpe. — Observations on the Characters of the Echinoidea. 



Part I. On the Species of the Genus Briisus and on the Allied Forms 



Meoma and Metalia : F. Jeffery Bell. 

 Royal Institution, at 3. — Animal Development: Prof Schafer. 



WEDNESDAY, March 5. 

 Royal College of Surgeons, at 4. — Comparative Anatomy of Man : Prof. 



Flower. 

 Society of Arts, at 8.— Necessity for Popular and Practical Teaching of 



Sanitary Science : J. J. Popie. 



THURSDAY, March 6. 



Royal Society, at 8.30. — Observations on the Physiology of the Nervous 

 System of the Crayfish {Astacus Jiuviatilis): J. \S ard. — Preliminary Re- 

 port upon the Comatulse of the Ckallenger Expedition: P. H. Carpenter. 

 — On the Character of the Pelvis in the MammaLa and the Conclusions 

 respecting the Origin of Mammals which may be based upon them : Prof. 

 Huxley, Sec. R.S. 



Linnean Society, at 8.— On Bacterium lactis : G. R. Milne Murray. — 

 Classificati^n of the Maioid Crustacea or Oxyrhyncha : Edward J. Miers. 



Royal Institution, at 3.- Sound : Prof. Tyndall. 



London Institution, at 7. — English Pronunciation : E. B. Nicholson. 

 FRIDAY, March 7. 



Royal iNSTirirriON, at 9. —Prof. Huxley. 



Society of Arts, at 8. — The Plants of India for Commercial Purposes : 

 J. R. Jackson. 



Royal College of Surgeons, at 4. — Comparative Anatomy of Man: Prof. 

 Flower. 



Geologists' Association, at 8. 



SATURDAY, March 8. 



Royal iNSTrruriON, at 3. — Colbert and Richelieu: W. H. Pollock. 



Physical Society, at 3. — On a New Theory of Terrestrial Magnetism : 

 Professors Ayrton an d Perry. — On some Experiments with the Quadrant 

 Electrometer: Dr. J. Hopkinson. — On the Maintenance of Constant Tem- 

 peratures and Pressures : F. D. Brown. 



84 pp., with 136 Plates, demy Svo, cloth, 3aj. 



PHOTOGRAPHED SPECTRA. One 



Hundred and Thirty-six Photographs of Metallic, Gaseous, and other 

 Spectra printed by the Permanent Autotype Process, w.th Introduction, 

 Description of Plates, and Index, and w.th an extra Plate of the Solar 

 Spectrum (showing bright lines), compared with the Air Spectrum. By 

 J. RAND CAPRuN, F.R.A.S. 



" . ... Mr. Capron has earned the thanks of spectrospopists for the 

 large amount of useful work which he has performed for them in the way 

 of prelim nary investigation. No exact scale or measurement accompany 

 the photographs, and they will be chiefly useful in indicating by comparison 

 with each other the lines which belong to particular metals, and the con- 

 ditions under which particular l.nes are produced But although no 



exact measurements are given, and although the photographs vary very 

 perceptibly in length, nearly all show lines which can be used as reference 

 lines, by measurement from which the wave-lengths of the metal Lnes can 



be determined iThe advantages of the photographic method are 



noticed by the author as follows : — ' Absolute truth is everything in spectro- 

 scopic work, and the very best draughtsman working w»th the most perfect 

 inicrometer cannot, even at the expense of a vast amount of labour, equal 

 in accuracy a good photograph of a set of spectral lines.' .... The pho- 

 tographs obtained from the electric light are particularly interesting. This 

 is, as far as we know, the first extensive series of measurements of spectra 

 obtained by the ignition of substances in the electric arc." — Philosophical 

 Magazine. 



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