PROF. V. A. LATHAM, D.D.S., F.R.M.S., ETC., FREDK. GAERTNER, A.M., M.D., J. STEVENSON BROWN, President Montreal Micro. Soc., FILANDRO VICENTINI, M.D., Chieti, Italy. VOL. II. THIRD SERIES. London: BAILLIERE, TINDALL, & COX, 20 KING WILLIAM ST., STRAND. BATH I CAMBRIDGE PLACE. ` 1892. Preface. HE present part completes the Second Volume of our Third, and the Eleventh of the entire series. During the year we have endeavoured to carry out the promises made at the close of our last volume, and from the number of congratulatory letters received, the improvement in the Journal appears to have given great satisfaction to our readers. Many replies have been received in answer to the circular issued in the previous number with respect to the enlargement of the Journal. On tabulating them, we find that 80 per cent. are not only in favour of, but are very desirous for the increase of pages. We have, therefore, resolved to take the opinion of this great majority, and increase each number to about 112 or 120 pages, thus making the Journal one of the largest and best Microscopical Journals published. Several foreign leading microscopists have kindly offered. themselves as Associate Editors, viz. :-Prof. V. A. Latham, D.D.S., F.R.M.S., Chicago University, U.S.A.; Dr. F. Gaertner, Pittsburg, Pa., U.S.A.; J. Stevenson Brown, Esq., President of the Montreal Microscopical Society, Montreal, Canada; and Dr. Filandro Vicentini, Chieti, Italy. From each of the above we hope to receive much valuable help otherwise unattainable. Many new features will be introduced into the new volume. Amongst others we may mention :-A series of illustrated articles on the Microscope and its Accessories; papers on Photo-Micrography; and a Bibliography, giving the titles of all the most interesting articles found in other Journals relating to Microscopy and kindred subjects. The papers on Microscopical Technique, which have met with such universal approval, will be continued; and The Half-Hours with Mr. Tuffen West, and Selected Notes from the Note-Books of the P.M.S.-which have been almost crowded out during the past year—will be resumed and fully illustrated. We hope, too, that considerable improvement will be noticed in our lithographic plates. Our best thanks are very cordially given to all friends who have so liberally supplied us with papers, and to our subscribers, whose numbers, we hope, will be very materially increased during next year. THE INTERNATIONAL JOURNAL OF MICROSCOPY & NATURAL SCIENCE: THE JOURNAL OF THE POSTAL MICROSCOPICAL SOCIETY. "Knowledge is not given us to keep, but to impart; its worth is lost in concealment." [The Editor does not hold himself responsible for the views of the authors of the papers published.] Presidential Address. how to Exhibit Microscopic Objects to a Large Audience. BY WM. PUMPHREY. THINK that no one who has taken part in any popular display of microscopic phenomena, or has been present at any lecture, where the subject embraced the microscopic structure of plants or animals, or even of rocks and crystals, but must have felt how unsatisfactory the demonstration has been-and this, not because of the want of ability or knowledge on the part of the lecturer or demonstrator, but from the want, in the first place, of previous training on the part of the audience, and secondly, from the physical difficulties inseparably connected with the examination and display of very minute objects. My intention this evening is, not to tell you what is the best way to overcome these difficulties, but, if possible, to contribute B |