ADVERTISEMENTS. 



THE POSTAL EXCHANGE CLUB. 



teness of the season and want of duplicates by several of the mein- 

 ers, as well as by myself, led me to postpone the commencement of the 

 club's operations, but the time has now arrived when it should be started 

 again. 1 purpose to send off the boxes in Circuit No. 1. about August 3rd, 

 Circuit No. 2. about the 10th, and Circuit No. 3. about the 17th, so as 

 separate them. I have not sufficient new members for a fourth round, 

 but will make a change each month till I have more. I think baskets will 

 be more serviceable than the light boxes hitherto used, and propose to make a 

 levy of 6d. per member, which can be sent direct or enclosed with the 

 boxes.— John E. Robson, Hartlepool. 



ALBO-OABBOF, 



A SUBSTITUTE FOB NAP1HAL1NE. 



I have had many enquiries where and how this preservative may be obtained, 

 as it is very much cheaper than Napthaline, and is said to be equally effective. 

 It not being an article of common sale, 1 have procured a quantity, and will 

 supply any one wanting it at 6d. for 8 ounces, post free. 



JOHN E. ROBSON, Hartlepool. 

 Price 4d. Monthly, 



THE SCIENTIFIC ENQUIRER, 



Is intended to afford to the Scientific Enquirer a medium through which 

 he may ask for and obtain information on every Scientific Subject. It is 

 divided into the following sections, viz. — Queries, Answers, Short Papers 

 and Notes, Extracts, Reviews, Correspondence, Sale and Exchange 

 Column, &c. 



FIFTH YEAR OF PUBLICATION. 



THE JOURNAL OF 



Microscopy and Natural Science, 



Published Quarterly, Price i/6. 



s the recognised organ of the POSTAL MICROSCOPICAL SOCIETY, 

 and contains a number of valuable and interesting articles relating to every 

 department of Microscopy and the allied Sciences, written by experienced 

 Microscopists and Specialists, and illustrated by a number of Lithographic 

 Plates. It is not only one of the largest and cheapest, but also one of the 

 most widely circulated Journals of its class. 



Both Journals are Edited Published by Mr. Alfred Allen, Hon. Sec. of the 



Postal Microscopical Society. 



Is 



London: BAILLIERE, TINDALL, & COX, 20, King William St., Strand, W.C. 



And all Booksellers. 



