ADVERTISEMENTS. 



THE POSTAL EXCHANGE CLUB. 



The third box is now on its round, but there are vacancies for three members to com- 

 plete the sets, which I shall be glad to have filled up. Some members are sending the 

 box on without advising me, which please avoid ; a post-card will do. Next month I will 

 have results of earlier rounds to announce. All communications to be addressed — JOHN 

 E. ROBSON, Hartlepool. 



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April Part, consisting of 80 pages, now ready. 



The Journal of MICROSCOPY & NATURAL SCIENCE. 



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This well known Journal,' the recognized organ of the "POSTAL MICROSCOPICAL 

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These are all written by experienced Microscopists and Specialists in their various depart- 

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Other special features of the Journal are " Half-Hours at the Microscope with Mr. Tuffen 

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 New books relating to Microscopy, or to any branch of Natural Science, are carefully 1 

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 There is also a section devoted to "Current Notes and Memoranda," " Exchanges, "&c; 



The Journal of Microscopy and Natural Science is edited by Mr. Alfred AllenI 

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