ADVERTISEMENTS will be inserted at the rate of 5s. per inch for 

 each insertion. A discount of 25 % if booked for the year. All 

 charges must be paid in advance. 



Reprints. — Authors desiring additional copies of their papers, may have the same 

 on payment of printer's charges, if ordered on return of proof. 



A Monograph of the Slug's of the British Isles (In preparation). 



It is intended in this work to give a full and exhaustive account of the Natural 

 History of the Slugs of the British Isles, together with figures and full descriptions 

 of all the known species and varieties. Special attention will be given to the 

 anatomy and variation. 



Specimens of any British species or varieties will be gratefully acknowledged. 



All communications should be addressed to — 



W. E. COLLINGE, Mason University College, Birmingham. 



XiviuG Specimens for the HDicroscope- 



\'olvox, SpirogjTa, Desmids, Diatoms, Amoeba, Arcella, Actinosphterium, 

 \'orticella, .Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other 

 Specimens of Pond Life. Price 1/- per Tube, Post Free. Helix pomatia, Astacus, 

 Amphioxus, Rana, Anodon, &c., for Dissection purposes. 

 THOMAS BOLTON, 25, BALSALL HEATH ROAD, Birmingham. 



SHELLS-LAND, FRESHWATER, & MARINE. 



LARGE AND RICH COLLECTIONS FROM ALL PARTS OF THE 



WORLD ALWAYS ON HAND. 



Catalogue No. V, Free on application. 



H. FRUHSTORFER, THURM STRASSE 37, BERLIN, N.W. 



W. HARRIS, 176, Bristol Street, Birming-hara, 



HORTICULTURAL BUILDER, CABINET MAKER, &c. 



Contractor for Fittings and Joinery Work to Mason University College and the 



Queen's Faculty of Medicine. 



Estimates given for every description of Woodwork, Cabinet Making, 



I louse Carpentry, &c. Repairs promptly attended to. 



Museum Humfredianum. — The undersigned would be glad to 

 exchange for or purchase a copy of the "Museum Humfredianum," being "a 

 catalogue of the large and valuable museum of Mr. George Humphrey, con- 

 taining many thousand curious subjects (including shells) on Natural History." 

 8vo, London, 1779. (This is possibly a sale catalogue.) 



W. M. WEBB, F.L.S., 2, The Broadway, Hammersmith, London, \V. 



