II 



HARD WICKE'S SCIENCE- G OSSIP. 



MICROSCOPIC PREPARATIONS. 



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

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



Spirogyra communis In conjugation. Is. 2d., post-free. See " Science -Gossip," July, 1890. Page 163. 



The Phantom Shrimp, Caprella linearis, 

 for Polariscope or Paraboloid. Is. 6d., 

 post-free. 



12, VORLEY ROAD, 



(TWENTY YEARS WITH THE LATE E. WHEELER.) 



O O Kl <C! HP Ur Y M^AM Hydroid Zoophyte, showing Tentacles 

 r*< Jl\ IV JTV. JT> I M I fX A \ 9 !\J . extended and head surrounded with gono 

 B-M. A K A U A_l * A A a S H a phores, for Paraboloid. Is. 6d., post-free 



UPPER HOLLOWAY, LONDON, N. 



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

 Geological Position, in Mahogany Cabinets. 



SjieciMieiis, !£;»«. 20® Specimens, 50s. TH»o 1>est value obtainaMe. 



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



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



SECOND-HAND I 



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 ; costj£i5 ; price £8 ior. Crouch's " Student's " Binocular Microscope with 

 best 3th Objective and a i-in. ditto by Ross, in Mahogany Case; price £9. A bargain. Ross' Five Guinea 

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

 price £2. 



SANDS, HUNTER & Co., 20, CRANBOURN ST., LONDON, W.O. 



THE LIFE- HISTORY 

 OF THE 

 HESSIAN FLY. 



A most interesting and 

 instructive Lecture on this 

 Pest. 



With between 60 and 70 

 Original Illustrations. 



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 DRAWING, IN THE OXY-HYDROGEN LANTERN. 



11, PAROLLES ROAD, MIRANDA ROAD, LONDON, N. 



NEW PREPARATION. 



Section through Compound 

 Eyes of Drone Fly. 



(Erastalis Tenax.) 



Showing Facets, Rods, &c. 

 Is. 7d., post-free. 



I.'S 



Very convenient and portable, gives ample Illumination, has all necessary adjustments, is provided 

 with a Cylindrical Case, and can be conveniently carried in the breast coat pocket; when charged 



with sufficient Oil to burn for above 3J hours, weighs under 12 oz. Price 8s. 6d. 

 Microscopists who are in the habit of exhibiting at the Meetings of their respective Societies and elsewhere, 



should provide themselves with this little Lamp. 

 MICRO- PETROLOGY, TYPICAL ROCK SECTIONS, 1/6 AND 2/- EACH. 

 JAMES HOW & Co., 73, FARRINGDON STREET, LONDON. 



LECTURES ON PHY SICAL GEOGRAPHY, GEOLOGY, BOTA NY, AND ZOOLOGY. 



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. 



SPECTACLES can loe sent by post and receive immediate attention. MICROSCOPES, TELESCOPES, OPERA and FIELD 

 GLASSES, ANEROID and other BAROMETERS. Scientific Instruments of every description put in WORKING order or 

 MADE AS NEW, Estimates sent. Apparatus Fitted. 



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



(Corner of Weymouth Street.) 



MICROSCOPY.— MICRO-NATURAL HISTORY (ZOOLOGICAL AND 

 BOTANICAL) AND THE ALLIED SCIENCES. 



Just Published, and will be sent Post Free for Two Stamps, W. P.Collins's Neio Catalogue of Books (mostly Secondhand]. \ 

 Scientific Libraries Purchased and Books taken in Exchange. 



W. P. COLLINS, Science Bookseller, 157, Great Portland Street, London, W. 



