August 21, 1879] 



NATURE 



cxxxix 



THE CHEOMOGRAPH. 



This is the most Wonderful Invention yet Manufactured, 



BY WHICH FROM 



Fifty to Sixty Copies of any Circular, Drawing, Music, or Plan, can be produced 

 in a few minutes in Violet, Red, or Green Ink. 



It will be exhibited at the Soiree of the British Association to be held at Sheffield, Sold by 



PARTRIDGE & COOPER, 



MA NUFA CTURING STA TIONERS, 

 192, FLEET STREET, AND i & 2, CHANCERY LANE, LONDON. 



specimens of the work done by this apparatus with full description and Price List will be forwarded post free on application. 

 Messrs. P. & C. are Sole Manufacturers and Vendors of this incomparable writing paper — "The Vellum Wove Club House Paper.' 



Now ready, 8vo, price 6,r. 



A TREATISE ON THE APPLICATION OF GENERALISED CO-ORDINATES 

 TO THE KINETICS OF A MATERIAL SYSTEM. 



BY 

 H. W. WATSON, M.A., and S. H. BURBURY, M.A. 



Oxford : Printed at the Clarendon Press, and Published by Macmii.lan & Co.,London, Publishers to the University 



THE TELEPHONE COMPANY, LIMITED, 



36, COLEMAN STREET, LONDON, E.G. i 



TESTIMONIALS. 



145 to 149, Tottenham Court Road, London, W., \^h May, 1879 

 To the TzLKTHont. Company, Limited, 36, Coleman Street, B.C. 



Dear Sirs, — You will be pleased to hear that the forty Telephones you supplied answer admirably, and are of great con- 

 venience, communicating as they do in some cases with our workshops a mile away. 



The simplicity and ease with which they work, being able to be used by any one, and the great advantage over the Telegraph 

 fystem in rapid communication and recognition of the voice, must create a great demand for Telephones everywhere. — We remain, 

 dear Sirs, yours faithfully, ' (Signed) J. MAPLE & Co. 



Midland Railway Telegraph Department, Superintendent's Office, Derby, 2StA April, 1879 



Dear Sirs, — In reply to your inquiry of the 25th inst, I have the pleasure to mform you that the Telephones which have 

 been erected on the Midland Railway are working very satisfactorily. — Yours faithfully, (Signed) W. LANGDON 



The Telephone Company, 36, Coleman Street, London, E. C, 



Application for Price Lists or further information to be made to the Manages. 



EAGLE INSURANCE COMPANY, 



79, PALL MALL. 



Fox LlVKS ONLY. ESTABLISKBD 2807. 



Net Premiuint and Interest ».»».»»..«»• ;£396,8i8 



Accumulated Funds .«».».»««.•«».*» ;£3,o83,3Si 



Also a Subscribed Capital of more than ... »..«». ^1,500,000 



Reports, Prospectuses, and Forms may be had at the Office, or from an) 



•f the Company s Agents, post fiee. 



GEORGE HUMPHREYS, Actuary and Secretary. 



SUBSCRIPTIONS TO NATURE 



Yearly its. 



Half-yearly 14J. W. 



Quarterly "js. td. 



To the Colonies, United States, the Continent, and 

 all places within the Postal Union 



Yearly 



Half-yearly .... 

 Quarterly 



301. 6d. 

 1 5 J. td. 

 8j. 



Office : 29, Bedford Street, Strand. 



DIAMONDS AND OTHER PRECIOUS 



STONES. Scientific opinion pvenM to GENUINENESS, PURJTV 

 and VALUIC.^Bkycb Wkigut, 90, GrcM Ruuclt btreec, Loiwioa, 



OLDRIDGE'S BALM OF COLUMBIA 



Prevents Baldness and the Hair turning Grey, and forms the 



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



and causes the 



WHISKERS AND MOUSTACHIOS to GROW FREELY. 



Sold everywhere, y. 6d., 6s. 6d., and lit.. 



Wholesale and Retail. 



M, WELLINGTON STREET, STRAND, LONDON, W.C. 

 EsTABLfSHrto Sixty Years. 



HOLLOWAYS PILLS 



THIS 

 MEDICINE 



2a a Certain Cure for all Diiorders of the LIVEB, STOMACH 

 AND B0WDL8. A Great FUBIFIEB of the BLOOD; a 

 Powerful Invigorator of the SjBtem, in casei of WEAKNESS 

 AND OEBILIIY, and ta nne^nalled in Female Oomplaint». 



