JCLV 13, 1905] 



NATURE 



JENA LABORATORY GLASSWARE. 



BOILING FLASKS. BEAKERS, 



RETORTS, TEST TUBES, TUBING 



FOR EXPLOSION FURNACES. 



COMPOUND TUBING (D.R.P.) 



Resisting in a high 

 changes of tenipen 

 action of cotrosiue 



sudden 

 nd till- 



Combustion Tubing for Eiemen- % 

 tary Analysis. C'oTlppiiluon") "^^ ' 

 SCHOTT & GEN. Glassworks, Jena (GERMANY). 



he U.K., on sale with the following firms : 



AlaucheKter. 

 5 St. FREDK. JACKSON & Co.. 



The Jena Gl 



Aberdeen. 



A. & J. SMITH, 23 and 25 St. 



Nicholas Street. 



Biriiiiuerhain. 

 F. E. BECKER & CO. (W. and 



J. George, Ltd., Successors), 159 



and 160 Great Charles Street. 

 PHILIP HARRIS & Co., Ltd.. 



Edmund Street. 



Dublin. 

 F. E. BECKER & CO. (W. and 



J. George, Ltd., Successors), 182 



Great Brunswick Street. 

 PHILIP HARRIS & Co., Ltd., 



179 Great Brunswick Street. 

 <>lRB£;ow. 

 F. E. BECKER & CO. (W. and 



J. George, Ltd., Successors), 36 



Renfrew Street. 



LeedH. 

 REYNOLDS & BRANSON, Ltd., 



14 Commercial Street. 



JAMES WOOLLEY, SONS h 

 Co., Ltd., Victoria Bridge. 

 .\<-ivi'a>ll<-u|>iin-Tyne. 



BRADY & MARTIN, Ltd. 

 London. 



BAIRD & TATLOCK (London) 

 Ltd., II Cross Street, Hatton 

 Garden, E.G. 



F. E. BECKER & Co. (W. and J. 

 George, Ltd. , Successors), 33 to 37 

 Hatton Wall, HattonGarden, E.G. 



A. GALLENKAMP & Co., Ltd., 

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JOHN J. GRIFFIN & SONS, 

 Ltd., 20-26 Sardinia Street, 

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TOWNSON & MERCER, 34 

 Camomile Street, E.G. 



LIQUID AIR AND LIQUID HYDROGEN. 



Dt. HAMPSON'S AIR-LIQUEFiER is now made to a standard pat- 

 tern, and numbers are in use in University Laboratories and elsewhere in 

 various countries. The whole apparatus is neat and compact and its parts 

 very easily moved ; the Liquefier, without stand, being a cylinder 17 inches 

 high and 3 inches in diameter. 



It begins to liquefy air in from 6 to 10 minutes after tbe admission of air 

 at from 150 to 300 atmospheres pressure, making over a litre of liquid per 

 hour. 



It requires no auxiliary refrigerant and produces a perfectly clear liquid 

 which requires no filtering. 



The operator has only one gauge to watch and one valve to control. 



HYDROGEN LIQUEFIER to the designs of Dr. MORRIS W. 

 TRAVERS for use in conjunction with Air-Liquefier. 



RARE 



For Prices and Particulars apply to the Sole Makers :— 



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RADIUM SALTS & RADIO-ACTIVE PREPARATIONS. 

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HARRINGTON BROS., 



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Principal SIR WILLIAM TURNER and 



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Vol. XXXIX. New Series— Vol. XIX. Part IV.— July, 1905. 



Contents. 



Walter H. Gaskell, K.R.S. Origin of Vertebrates. 



F. G. Parsons, F. R.C.S. Pressure Epipliyses. 

 Walter Kidd. Papillary Ridges in Man. 



Wm. Wright, D.Sc. Skulls from the Round Barrows of East Yorkshire. 

 Gillman Moorhead, M.D. A Sirenomelian Monster. 



G. J. Jenkins, M.D. Cranio-cerebral Topography, 

 robn Cameron, M.D. The Development of the Retina. 



b. Macr.ie Aitken. Variations of the Tibia and Astrag.alus. 

 M. Bertbelot. Limits of the Sensibility to Odours. 

 Charles R. Whittaker. Abnormality of the Renal Arteries. 

 Edward Fawcett, M.B. Ossification of the Lower Jaw. 

 Bertram C. A. Windle, M.D. Recent Teratological Literature. 

 Proceedings of Anatomical Society. 



No 



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Part 173. Price 51. 

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and Standards " ; " The Alternating Current 



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