xviii 



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lOO Specimens, SSifrs. 2©© Specimens, ;>Os. Tlie B»estf value obtainable, 



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SECOND-HAND MICROSCOPES AND OBJECTIVES. 



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

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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., 



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Section through Compound 

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(Ekastalis Tenax.) 

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MICROSCOPY.— MICRO-NATURAL HISTORY (ZOOLOGICAL AND 

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