cl 



XXVlll 



NATURE 



\_April I, 1879 



0. TlSLEYdCo., 



OPTICIANS. 

 X72, BROMPTON ROAD, S.W. 



(Close to South Kensington Museum). 



THE PHONEIDOSCOPE 



An In.strument for Observing the Colour-Figures of Liquid Films under the 



action of Sonorous Vibrations. 



Being a visible demonstration of the Vibratory and Moleculiu: Motion of a 



Telephone Plate. 



The PHONEIDOSCOPE, with 3 Discs, Bottle of Solution, Descriptive 



Pamphlet, &c., in Cardboard Box, lot. (>d. 



MANUFACTURED AND SOLD WH0LK8ALB AND RBTAIL BY 



S. C. TISLEY & CO., 172, BROMPTON ROAD, LONDON, S.W. 

 TELEPHONIC ELECTRICITY. All Materials suppUed for experi- 

 mental purposes. 



Price Lists of Electrical and Acoustic Apparatus, with Drawings and 

 Description of the Harmonos:raph, Post Free, 2d. 



NOXA' READY. 



SECOND EDITION, 



GRIFFIN'S 



CHEMICAL HANDICRAFT. 



PRICE 4S. yd. POST FREE. 



A CATALOGUE OF CHEMICAL APPARATUS ; 



ILLUSTRATED, CLASSIFIED DESCRIPTIVE. 



Demy 8vo, 480 pp., Illustrated with 1,600 Woodcuts. 



Mosl Complete And Cheapest List of Apparatus. 



JOHN J. GRIFFIN and SONS, 22, GARRICK STREEl, 

 LONDON, W.C. 



THE MINIATURE MICROSCOPE LAMP 



(REGISTERED) 

 PRICE 14J. PORTABLE TIN CASE FOR DITTO, 2s. 6a. 



JAMES HOW & Co., 



SCIENTIFIC INSTRUMENT MAKERS, 



5, ST. BRIDE ST. (late 2, Foster Lane\ LONDON. 



OLDRIDGE'S BALM OF COLUMBIA 



Prevents Baldness and the Hair turning Grey, and fonns the 



Basis of a Magnificent Head of Hair, Strengthens Weak Hair, 



and causes the 



WHISKERS AND MOUSTACHIOS to GROW FREELY. 



Sold everywhere, 35. dd., 6j. 6d., and 11 j'., 



Wholesale and Retail. 



a«, WELLINGTON STREET, STRAND, LONDON. W.C. 

 Established Sixty Years. 



HOLLOWAYS PILLS 



THIS 

 MEDICINE 



Is a Certain Cure for aU Disorders of the LIVEE, STOMACH 

 AND BOWELS. A Great PUEIFIEE of the BLOOD; a 

 Powerful Invigorator of the System, in cases of WEAKNESS 

 AND DEBILIIY, and is nneqnalled in Female Complaint*. 



CROOKES' 



ULTRA GASEOUS STATE OF 



MATTER. 



MESSRS. MAWSON & SWAN 



Are prepared to supply the following Vacuum Tubes illustrating 

 Mr. Crookes' recent researches : — 



1. THE ELECTRICAL RADIOMETER, 



shewing the dark layer of freely vibrating molecules by which, on Mr. 

 Stoney's theory, the rotation is effected. 



2. THE CUP ELECTRICAL RADIOME- 



TER, shewing the convergence of the mDlecular streams on the concave 

 side of the vane. 



3. THE " BLUE FOCUS," a Concave Re- 



flector at moderate exhaustion, shewing the remarkable appearance of 

 a luminous focus in an " optically pure" vacuum, without the presence 

 of any solid or floating particles. 



4. THE ''GREEN FOCUS." 



At this e.xtreme exhaustion the momentum of the molecules is ex- 

 pended on the glass, which becomes flujrcscent at the focus, and very 

 hot. 



5. MOLECULAR SHADOWS. 



The molecules impinging on the surface of the glass render it fluores- 

 cent, except where diverted by any solid object placed in their path. 

 Hence apparently black shadows of glass figures are projected on the 

 bulb, and if the molucules are caused to.alter their path by bringing a 

 magnet near to the tube, the shadows are twisted out of their position. 



EDWARD PATERSON, 



Electrical Engineer and Scientific Apparatus Manufacturer, 



3, BEDFORD COURT, COVENT GARDEN, LONDON. 



STEAM WORKS, GRAY'S INN ROAD. 



Experiments in Electric Lighting carried out 



Electrical Apparatus of all descriptions for Lecture Purposes 



Loaned out. 



APPARATUS FOR CLASS Demon- 

 stration and for SCIENCE SCHOOLS. 



ELECTRIC LIGHT APPARATUS. 

 SIEMEN'S and GRAMME'S DYNAMO 



MACHINES and LAMPS for Hire and Purchase. 



LARGE ASSORTMENT of RUHMKORFF 



COILS and VACUUM TUBES. 



PROFESSOR HUGHES' MICROPHONE. 

 ELECTRIC BELLS and INDICATORS. 

 TELEPHONES and TELEPHONE CALL 



BELLS, WIRE, &c., for Fixing. 



PROF. S. P. THOMPSON'S LANTERN 



SLIDE GALVANOMETER, 20s. 



EDISON'S ELECTRIC PEN £8 8s. 

 ELECTRIC and MAGNETIC APPA- 



RATUS of all Descriptions. 

 New Illustrated Catalogue of ()0 pages post free 6 stamps. 

 Orders over £2 carriage paid to any part of the United Kingdom. 



"That excellent periodical The Garden."— Professor Owen. 



THE GARDEN : A Weekly Illustrated 



Journal of Gardening in all its Branches. Founded and Conducted by 

 W. ROBINSON, F.L.S., Author of "Alpine Flowers for English 

 Gardens," &c. 



A Coloured Plate is now issued with every number of Tlie Garden. 

 " Mr. Robinson's valuable and elegant weelily."— Saturday Review 

 Aug. loth, 1872. 

 The following are some of the subjects regularly treated of in its pages :— 

 The Flower Garden. Hardy Flowers. 



Landscape Gardening. 

 The Fruit Garden. 

 Garden Structures. 

 Room and Window Gardens. 

 Notes and Questions. 

 Market Gardening. 

 Trees and Shrubs. 



Town Gardens 



The Conservatory. 



Public Gardens. 



The Greenhouse and Stove. 



The Household. 



The Wild Garden. 



The Kitchen Garden. 



Professor Asa Gray says : " It seems admirably adapted to the wants andj 

 tastes of gentlemen who are interested in rural affairs. By such we hear it 

 highly spoken of; and we think we do a favour to those of that class whaj 

 know it not as yet, by calling attention to it." 



Price 6d. Weekly. Specimen Copy, Post-free, C^d. 



Terms of Subscription. — Sent direct from the Office in London, post free.l 

 payable in advance— For One Year, 26s. ; Half a Year, 14s. ; Quarter of M 

 Year, 7^. Address all letters concerning Subscriptions to— The Publisher or" 

 The Gmrden, 37. Southampton Street, Covent Garden, London, W.C. 



