clxiv NATURE [Sept. ii, 1879 



W. LADD 8c CO., 



SCIENTIFIC INSTRUMENT MANUFACTURERS 



(By Appointment to the Royal Institution of Great Britain), 

 II AND 12, BEAK STREET, REGENT STREET, W. 

 IMPROVED HOLTZ ELECTRICAL MACHINES, with 4 to 24 Plates. Immediately available in any cDr.dlticn if the atmosphtre. 

 LADD'S DYNAMO-MAGNETO MACHINE and GRAMME'S MAGNETO-ELECTRIC MACHINE fjr Laboratory u-e. 



Physical Apparatus of every Description. 

 ILLUSTRATED CATALOGUE, SIXPENCE. 



PROFESSOR HUGHES' AUDIOMETER. 



The only perfect measurer for testing the hearing power. Vide Dr. Richardson's Report to the Royal Society, 

 May 15, 1879; Medical Times and Gazette, May 24, 1879. 



.S-OZ.fi AUTHORISED MAKERS, 



KROHNE & SESEMANN, 



8, DUKE STREET, MANCHESTER SQUARE, LONDON, W. 



THE TELEPHONE COMPANY, LIMITED, 



36, COLEMAN STREET, LONDON, E.G. 



TESTIMONIALS. 



14S to 149, Tottenliam Court Road, London, W., \ifh May, 1879 

 7"* M? Telephone Company, Limited, 36, Coleman Street, E.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 Telegn.ph 

 system in rapid communication and recognition of the voice, must create a great demand for Telephones everywhere. — ^Ve rem£.in, 

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



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



Dear Sirs, — In reply to your inquiry of the 25th inst., I have the pleasure to inform 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 Manager. 



SIR JOHN LUBBOCK'S NEW BOOKS." 



SCIENTIFIC LECTURES, with Coloured Plate and numerous Illustrations. 8vo. Zs. 6d. 



CONTENTS. 

 I. — On Flowers and Insects. 

 II. — On Plants and Insects, 

 III.— On the Habits of Ants. 

 IV. — ,, ,, (continued). 



V. — Introduction to the Study of Prehistoric Archaeology. 

 VI. — Address to the Wiltshire Archreological and Natural History Society. 



ADDRESSES, POLITICAL AND EDUCATIONAL. 8vo. 8.. 6d. 



Contents.— On the Imperial Policy of Great Britain— On the Bank Act of 1844— On the Present System of Pubhc School 

 Education, 1876 — On our Present System of Elementary Education— On the Income Tax — On the National 

 Debt — On the Declaration of Paris — Marine Insurances — On the Preservation of our Ancient National 

 Monuments — Egypt. 



MACMILLAN & CO., LONDON. 



In crown Svo, price 3J-. 6d. 



A YEAR 



IN A 



LANCASHIRE GARDEN-i 



BY HENRY A. BRIGHT. 



" It is full of admirable suggestions for the practical gardener as to the choice and arrangements of his plants, but 

 it will also be read with interest in the arm-chair in town. It is the story of a year's gardening WTitten by an 

 accomplished man, whose flowers tell him many stories and pleasant things not to be found in the nursery catalogue." 

 ' — Times. 



MACMILLAN AND CO., LONDON. 



Printed by R. Ci.av. Sons. ;\Nr> Tavior, at 7 and 8, Ercad Street H!!I, Queen Victoria Street, in the City of I,"ndon, and pi.bliihcd by 

 Ma;miii.an and Co., a: the OTice, 2. aid 3:, £ed'iri bire.t, Covent '.'arden.— Thurslv. ■, September 11 i;79. 



