xxvi 



HARDWICKE'S SCIENCE-GOSSIP. 



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

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The Phantom Shrimp, Caprella linearis, for Polariseope or Paraboloid. Is. 6d., post free. See " Science Gossip," Dec. 1890. Page 280. 



°S^± W *Tt£e ERNE ST H I N TO N SSSSiSi aM^siSS 



Human Tongue. IS. 6ai, post-free, A—i 111! A— A KJ A 11111 1 Vllj phores, for Paraboloid. Is. 6d„ post-free. 



12, VOKLEY ROAD, UPPER HOLLOWAY, LONDON, N. 

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GEOLOGICAL COIiIiE OTIOMS. 



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

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lOO Specimens, 200 Specimens, 5©s. 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^i5 ; price f8 io. r . Crouch's " Student's " Binocular Microscope with 

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

 Dissecting Microscope with 3 Lenses, price £2 3^. Beck's small Dissecting Microscope, as per Catalogue 32A., 

 price £2. ■ 



SANDS, HUNTER & Co., 20, CRANBOURN ST., LONDON, W.C* 



THE LIFE-HISTORY 

 OF THE 

 HESSIAN FLY. 



A most interesting and 

 instructive Lecture on this 

 Pest. 



With between 60 and 70 

 Original Illustrations. 



FRED. ENOCK, F.E.S., 



BEGS TO INFORM HIS NUMEROUS PATRONS THAT HE IS NOW 

 OPEN TO ENGAGEMENTS FOR 



POPULAR LECTURES 

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11, PAR0LLE8 ROAD, MIRANDA ROAD, LONDON, N, 



NEW PREPARATION. 



Section through Compound 

 Eyes of Drone Fly. 



(Erastalis Tenax.) 

 Showing Facets, Rods, &c. 

 Is. 7<L, post-free. 



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



OE©EO«-I«JAE SERIES. 



NEW AND ENLARGED EDITION OF CATALOGUE NOW READY. 



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MICRO- 



HOW'S MICROSCOPE LAMP. HOW'S POCKET MICROSCOPE LAMP. 



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



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



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SECOND-HAND MICROSCOPES and APPARATUS. 



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MICROSCOPY.— MICRO-NATURAL HISTORY (ZOOLOGICAL AND 

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

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