lxxiv 



HARDWICKE'S SCIENCE-GOSSIP. 



MICROSCOPIC PREPARATIONS. 



FIRST-CLASS SPECIMENS, New and Rare Objects in every Department of Microscopy. 

 LORD S. G. OSBORNE'S DIATOMESCOPE, Post-free, 12s. 



The Sea-Pen, Pennatula pkosphorea, showing Tentacles extended and surrounded with bundles of Spieulae, for Paraboloid- 

 Is. 6d., posi. free. See "Science Gossip," June. Page 139. 



Palate of Phsesianella Australis from fC* TTI O HP XJ T M /~\ M Section of Box brand, Pueeinia buxi» 



S.Australia. Opaque. Is. 2d., post-free. KLt K\ A » Sit O k IT 1 1\ k \S 1 » j Is. 2d. post-free. 



12, VORLEY ROAD, UPPER HOLLO WAY, LONDON, N. 

 (TWENTY YEARS WITH THE LATE E. WHEELER.) 



G-BOXaOG-IC/kJEa COLL3ES otiokts. 



Comprising FOSSILS, MINERALS, and ROCKS, labelled with Name, Locality, and 

 Geological Position, in Mahogany Cabinets. 



lOO Specimens, 25s. 300 Specimens, 50s. The best value obtainable* 



Micro- Sections of Rocks in great variety. Cabinets, Glass-Topped Boxes, and other Geological requisites. 



THOMAS D. RUSSELL, 78, NEWGATE STREET, E.C. 



SECOND-HAND MICROSCOPES AND OBJECTIVES. 



Binocular " Popular " Microscope by R. and J. Beck, with J-in. and i-inch Object Glasses, Stand Condenser,'and 

 double Nose-piece, in Mahogany Case ; cost ,£15 ; price £8 \os. Crouch's " Student's " Binocular Microscope with 

 best ^th Objective and a i-in. ditto by Ross, in Mahogany Case; price £9. A bargain. Ross' Five Guinea 

 Dissecting Microscope with 3 Lenses, price £$ y. Beck's small Dissecting Microscope, as per Catalogue 32A., 

 price £2. , 



SANDS, HUNT ER & Co., 20, CRANBOURN ST., LONDON, W.C. 



HEAD OF 

 SIX -EYED SPIDER 

 (Dysdera erythrina.) 

 Brilliant Opaque Objects, 



2s., post-free. 

 PUPA OF WOOD ANT 

 (Formica rufa). 

 For Paraboloid, 2s., post-free. 

 SYLLABUS OF 

 LECTURES, post-free. 



FRED. ENOCK, F.E.S., 



BEGS TO INFORM HIS NUMEROUS PATRONS THAT HE IS NOW 

 OPEN TO ENGAGEMENTS FOR 



POPULAR LECTURES 

 ON NATURAL HISTORY, 



PROFUSELY ILLUSTRATED BY PHOTOGRAPHS OF INSECTS AND 

 ORIGINAL DRAWINGS, IN THE OXY-HYDROGEN LANTERN. 



11, PAR0LLE3 ROAD, MIRANDA ROAD, LONDON, N. 



" Something quite new." 

 EGGS OF PSOCUS | 

 (an injurious insect), 

 SHOWING THE PARA- 

 SITIC FLY. In situ. 

 2s., post-free. 



HOW & CO.'S LANTERN SLIDES FOR LECTURES, &c. 



GEOLOGICAL SERIES. 



NEW AND ENLARGED EDITION OF CATALOGUE NOW READY, 



POST-FREE ON APPLICATION. 



HOW'S MICROSCOPE LAMP. HOW'S POCKET MICROSCOPE LAMP. MICRO- 

 PETROLOGY, TYPICAL ROCK SECTIONS, Is. 6d. each. 



JAMES HOW & CO., 73, V A Bl EC 1 X 4* « O X STREET, LOWOOS. 



LECTURES ON PHYSICAL GEOGRAPHY, GEOLOGY, BOTANY, AND ZOOLOGY 



J 



The Editor of SCIENCE-GOSSIP has Six Nights still open next Session to be engaged for 

 EXTEMPORANEOUS LECTURES (well Illustrated with Diagrams) to 



Natural History, Literary, and Scientific Societies, &c. 



For Terms, &c, apply to Editor of Science-Gossip, care of Messrs. Chatto & Windus, 214, Piccadilly, London, W. 



PODURA SCALES. 



A few choice Specimens for Sale, 

 3s. each. 



R. and J. BECK, 68, Cornhill, E.C. 



MICROSCOPIC OBJECTS for MOUNTING. 



Nine doubly stained Botanical or 18 Miscellaneous, is. id. per 

 Series, post-free. GUARANTEED QUALITY. 



All beginners should read the New Pamphlet, 



PRACTICAL HINTS ON MICROSCOPIC MOUNTING, 



6d., post-free. List of Objects One Stamp. 

 R. G. MASON, 69, Clapham Park Road, London, S.W. 



REPAIR DEPARTMENT. 



MICROSCOPES, TELESCOPES, OPERA and FIELD GLASSES, ANEROID and other BAROMETERS. Scientific Instruments 

 of every description put In WORKING order or MADE AS NEW, SPECTACLES can tie sent by post and receive Immediate- 

 attention. Estimates sent. Apparatus Fitted. 



CHAS. COLLINS, OPTICIAN, 157, GREAT PORTLAND STREET, LONDON, W. 



(Corner of Weymouth Street.) 



