NA TURE 



[May 4, 1905 



Sale b\) Hucttou. 



IMPORTANT COLLECTrON OF LEPIDOPTERA. 

 TUESDAY AND WEDNESDAY, MAY i6 and 17, at Unr o'clock. 



MR. J. C. STEVENS will Offer at his 



Rooms, 33 King Slreel, Covent Garden London. W.C, the second 

 poriin of the unrivalled COLLECTION OF BRITISH LEPI- 

 DOPTERA formed by the late Phild- B. Mas"N, II.R.C.S., F.C.S.. 

 K.Z S., F.ES., Sc. of Trent House, Burton-on-Trent, comprising 

 lone and superb series of most of the rare and extinct species, fine 

 varieties and local forms in the best state of preservation, also many 

 valuible and historic specimens and types from the Haworth and other 

 Collections, together with the first rate Standish and other Cabinets in 

 which they are arranged. 

 On View the Monday prior and Mornings of Sale. Catalogues ready a 

 week prior to Sale, post free on application. 



THE EXECUTORS 



COLONEL WAIKIN, C B. (In' 

 offering the foUowin.^ for sale : — 



OF THE LATE 



emor of the Range Kinder) aie 



6 in. Holtzaffel Laihe, with divided headstock and ov 

 and a very complete set of fittings for ena;ine, woo 

 turning, with a numerous assortment of small tools. 



4 H.P. de Dion engine, water cooled with tanks, &c., 

 by Canning and Co., 30 volts, 90 amps. 



7-6 volt Accumulators in teak cases, 9 amps. 



I H.P. Crocker Wheeler Motor. 



I in. Spark Coil. 



X-Ray Apparatus, consisting of 12 in. spark coil, ^ Cn 



'■> Bench and Tools. 



seen by appointment at Ordnance Houst 

 particulars may be obtained from Mr. 

 ent Maker, S Hatton Garden, London. 



Enfield 

 Hicks, 



For Photography, L'nsur/asicd for fine dcjlnUu^n. 



^KEirasfS 



Taylor,. TAyLOR.t. fioB50hl,,i:= 



G 



AMBRELL DROS. 



MANUFACTURERS 

 OF 



B 



CATALOGUED 



ELECTRICAL TESTING INSTRUMENTS, 



Durham Hoi'sk, North Side. 

 CLAPHAM COMIVION, LONDON, S.W. 



c :b .^ IS. e: IS, ' s 

 i^F^'_.ANATIC LENSES. 



Magnifying 6, 10, 15, and 20. 



IS - each, in Tortoiseshell or Nickel 



Plated Pocket Mounts. By post upon 



receipt of remittance 



2U HIGH HOLBORN, LONDON, W,C. 



NOTICE. 



Proof Copies of the Photogravure Portrait ol 

 PROF. SUESS appearingr in "Nature" of to-day 

 can be obtained from the Publishers at 5s. each. 



ST. M.A.KTINS STREET. LONDON, W.C. 



LIQUID AIR AND LIQUID HYDROGEN. 



Dr. 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 8 inches in diameter. _ 



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

 at from 150 to 200 atmospheres pressure, making over a litre of liquid per 



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. 



For Prices and Particulars apply to the Sole Makers :— 



BRIN'S OXYGEN COMPANY, LIMITED, 



ELVERTON STREET, WESTMINSTER, S.W. 



JAMES SWIFT & SON'S 



NEW PAN-APLANATIC OBJECTIVES 



OF THE HIGHEST POSSIBLE OPTICAL EXCELLENCE. 

 Apochromatics. 



J" N. A. ,1.30, 



■/lo;; ,, . '■3° 



Dry Series Pa.n-Aplanatics. 



,» N.A., 0.30 £2 5 I i" N.A.. 0.80 ... 



1" ,, 0.50 2 \" ,, 0.38 ... 



I" ,, 0.30 1 4 1 i" ,, 092 ... 



i*" Nature says: — "In the excellence of their 1/12-in 



oil immersion, they have produced an English-made 1 



capacity which is a marvel of cheapness." 



i.isrs POST FRF.F. ON APPLICATION. 



UNIVERSITY OPTICAL WOBKS, 



81 Tottenham Court Road, London. 

 IF Y©[J WANT T0 ©BTAliV eOPIES 



Circulars, Price Lists 

 Plans, Diagrams, Speci' 

 lications.iMusic, Ac. 



The Simplest a 

 Ctieapest Duplicai 



NO WASHING. NO MELTING. NO INKING. 



Write for Specimens, &c., ur call and see this useful l^^enlil)n. 



.a.XJTOCOF»"VIS'X" CO. (Dept. 1), 



64 Queen "Victox-ia. S«., X.>ondon, e:.C 



PHOSPHORESCENT POWDERS 



to Phosphoresce by Day 

 or Ultra-Violet Light. 



In Ileal Ebuiiite and Brass Boxes wilh 



Mica VVindou. 



Price 3/6 each, or 18,6 set of si.x. 



A. C. COSSOR, 54 Fapring-don Road. E.G. 



TELE1H..M.. ,o?47 CeN.K.M. 



Gold Medal awarded St. Louis Exhibition. 1904. 



NORWAY. S.Y. "MIDNIGHT SUN." 

 3,17s Tun.s. Two Berth Cabins All Berths 

 on same level. Finest yachting steamer afloat. 

 10 I 2 '— Sailing June 10 24 J^ July 8, 22J August 5, 



Apply ALBIO.V S.S. CO, LTD., 



Ne 



iTyne 



