January, 1907.] 



KNOWLEDGE & SCIENTIFIC NEWS. 



Vll. 



AN IDEAL PRESENT. 



The "DUPLEX" BAROGRAPH 



with our new Opal glass dial attachirent, showing present reading 



of the Barometer in addition to the record on the chart, very best 



quality, in solid oak, walnut, or mahogany case with bevelled edge 



plate glasses and chart drawer. 



£6 2 6 



Sole MANrFACTtRERS : 



PASTORELLI & RAPKIN, Ltd., 



ACTUAL MAKERS of all kinds of Meteorological Instruments, 



STANDARD INSTRUMENTS 



(with Kcw Certificates if liesircd). 



Esthd. 1750. Contractors to H.M. Govt. 



Te'egrams: " Rapkin, London." Telephone: 1981 Holborn, 



46, HATTON QARDEN. LONDON, E.C. 



Price, complete, with a year's supply 

 of Charts, Ink. and Instructions, 



lUit-^tTaiciI LUt of Standard Instrument:* Pofif Fref. 



SPECIAL ILLUSTRATED LIST OF BAROGRAPHS AND THERMOGRAPHS COVER. NG VARIOUS 

 PATTERNS' POST FREE 



The Fastest Colour Sensitive Plate 



in existence 

 is the 



Wrahen Verichrome. 



Unrivalled for 

 Photomicrography and Astronomy. 



Write tor Particulars to 



Wratten & Wainwright, Ltd., Croydon. 



The De La More Press. 



THE STUDY OF PLANT LIFE FOR YOUNG 

 PEOPLE. By M. C. Stopes, D.Sc. London. Designed 

 cover. Illustrated with plates and numerous diagrams. Royal 

 8vo, cloth. 2s. 6d. net. 



HYPNOTISM : its History, Practice, and Theory. 



By J. MiLXE Bkamwell, M.B., CM. Demy Svo, cloth. 

 i8s. net. 

 The chief aim of this monograph is to draw the attention of medical men to 

 the therapeutic value of hypnotism. The author has devoted the last twelve 

 years to hypnotic practice and research, and his personal observation of the 

 practical work done in France, Germany, Sweden, Holland, Switzerland, and 

 Belgium should also make the volume a valuable addition to the science of a 

 subject which is exciting much interest at the present time. 



LOGIC, DEDUCTIVE AND INDUCTIVE. By Carveth 

 Read, M.A., Professor of Logic at University College. Third 

 Edition, revised and enlarged. Crown Svo. 6s. 

 A LONG-STANDING WANT— FIRST STEPS TO GERMAN FOR 

 SCIENCE STUDENTS. 



A FIRST GERMAN COURSE FOR SCIENCE 

 STUDENTS: liy Professor H. G. Fiedler and F. K. 

 Saxdbach. With diagrams. Square Svo. 2s. 6d. net. 



This book is intended for science students who desire to read, with the ex- 

 penditure of the minimum amount of time, scientific text-books in German. For 

 this purpose it will be found a valuable aid to a practical working kirowledge i f 

 the German language. The grammatical portion is simple in arrangement and 

 brief, while the reading examples will be found of great assistance, and the dia- 

 grams illustrating scientific instruments and experiments help to tix the names in 

 the memory. 



A SECOND GERMAN COURSE by the same Authors, 

 js. Od. net. [In the I'lcss. 



THE LITTLE BLACK PRINCESS: A True Tale of 

 Life in the Never-Never Land. Py Mrs, .Lxkas 

 (" Jeannie ") Gunn. An entertaining experience of native life 

 on a station in the .Australian Bush. With many illustrations 

 from photographs. Square Svo, cloth, special cover design. 

 Third ICdition. 5s. net. 



"The author has a great sense of humour, and seizes on salient features of 

 native life and describes them in a few words : these gifts, combired with a re.il 

 sympathy with the blackfellow, have enabled her to write a little book that is full 

 of human interest." — Nature, 



A compute Catalogue will be sent on application. 



ALEKANDER MORING, Ltd., 32, george street, hanover square w 



ADAM 

 HILGER, 



LTD. 



CAMDEN ROAD, 

 LONDON, N.W. 



Awarded Gold Medal St. 

 Louis Exhibition^ 1904. 



TcUiTrams— "' Sphericity, London.'' 

 TelephonQ--lCi?7 North.' 



Lists on Application. — ■ 



ZOLLNER STAR SPECTROSCOPE 



(N^a,ti;ir<£(,l Size]. 



Adapted to any Eyepiece, with i Cylinder Lens . . £1 17 6 

 Ditto, with three different powers of Cylinder Lenses, 



Complete in Morocco Case . . . . . . . . £2 10 



BECK'S TELESCOPES 



New . 



Catalogue 



JU5T . . 



ISSUED, 



POST FREE. 



Telescope Object Glasses, 



Portable and Naval 



Telescopes, 



Astronomical Telescopes, 



DifTraclion 



Spectroscopes, 



Surveying Instruments 



DESCRIPTIVE CATALOGUE 



l\^st Free I'll appUCiiti:»i to — 



R. & J. BECK, LTD., 68, GORNHILL, LONDON. 



