Sarcophagidæ from all parts of the world bought or exchanged, according to arrangement. North American material determined. R. R. Parker, Ent. Lab., Mass. Agri. College, Amherst, Mass. ==================================================== Journal of Entomology and Zoology--_Advertising Section_ ==================================================== Ward's Natural Science Establishment Founded 1862 Incorporated 1890 Natural Science Supplies =Mineralogy=: Prepared collections; Blowpipe and Laboratory material; Museum specimens, etc. =Geology=: Fossils and Rocks in collections, and Museum specimens; Casts, Models, Charts, etc. =Biology=: Systematic collections; Laboratory material for dissection; Museum specimens; Models, Charts, Microscope slides, etc. =Birds=: =Mammals=: (Skins and skeletons.) =Entomology=: Supplies; Systematic and Economic collections; Museum specimens, etc. =Anatomical Models=; =Sponges=; =Corals= and other invertebrates. =Catalogues and Price Lists in all departments sent free on request.= Recent Catalogues and Circulars: P. 29. Microscope Slides. P. 26. Comparative Osteology. P. 125. Life Histories of Insects. P. 115. Collections of Fossils. P. 116. Museum Cases. P. 127. Histology. P. 137. Botanical Mounts. P. 134. Complete Trilobites. P. 106. Lull Restorations and Models. We have the largest and most complete stock of any dealer in the world. Fifty Years of Service. Address: =Ward's Natural Science Establishment=, 84-102 College Ave., Rochester, N. Y. ==================================================== Journal of Economic Biology _Edited by Walter E. Collinge, M. Sc., F. L. S., F. E. S._ Contains articles treating of all branches of Economic Biology, Entomology, Parasitology, Mycology, etc. Fully illustrated by lithographic plates and text figures. A few sets of Vols. 1-8 still remain, price $5 each. Volume 9, now in course of publication, will consist of four parts, price $5. --------------- _All editorial communications should be addressed to Walter E. Collinge, 8, Newhall Street, Birmingham, and all subscriptions to_ --------------- Messrs. Dulau & Co., Ltd. 37 Soho Square, London, W., England ==================================================== GRIFFITH Incubators [Illustration] A simple, well constructed bacteriological incubator ==================================================== Butterfly-Hunting in Many Lands Notes of a Field Naturalist By George B. Longstaff, M. A., M. D. (Oxon.),