ADVERTISEMENTS. 



H.W. H. D3RLASTON, 



31, Freer Road, 

 Birchfield, Birmingham, 



Preparcr of all classes of Microscopical Slides. 



Send Sevenpence for sample and catalogue. 



Circulating System of Micro Slides. 



For a subscription of 25/-, payable in advance, 

 a series of twelve boxes, each containing at least 

 twelve slides, will be sent to subscriber. From 

 each box four slides may be retained free. Forty- 

 eight in all. Further slides may be retained at 6d. 

 each. Photo- micrographic Lantern Slides, I/- each. 



Pond Life and other delicate objects mounted in 

 fluid, TRUE TO LIFE. 



CLARKE & PAGE, 



Opticians, 

 104-6, Leadenhall St., LONDON. 



Readers will do well to send for our Catalogue, 



which contains particulars of Objectives, Slides, 



and Instruments for Photo-micrography. 



Objectives A very fine series, specially corrected for Photo- 

 graphy, giving great depth of focus and fine definition. 



Slides A stock of over 20,000, Insects, Marine, Diatoms, Geo- 

 logical, Botanical, etc., etc. Clean specimens for photographing. 



Microscopes A good stock of second-hand kept. All 

 makes supplied at list prices. 



Photo-micrographs, Lantern Slides, or Prints a very 

 varied stock. 



Enquiries Invited. Lists Free. 



