SCIENCE. 



[Vol. XVI. No. 394 



THE 



M 



COMPANY. 



98 MILK ST,, BOSTON, MASS, 



This Company owns tlie Letters 

 Patent granted to Alexander Gra- 

 ham Bell, March 7th, 1876, No. 

 174,465, and January 30, 1§77, 

 No. 186,787. 



The Transmission of Speech by 

 all known forms of ELECTRIC 

 SPEAKING TELEPHONES in- 

 fringes the right secured to this 

 Company by the above patents, and 

 renders each individual user of tel- 

 ephones, not furnished by it or its 

 licensees, responsible for such un- 

 lawful use, and all the conse- 

 quences thereof and liable to suit 

 therefor. 



JAMES M'CEEERY S, CO. 



Have placed on sale this week a large 

 line of Scotch and English Cheviots in 

 small patterns, 54 inches wide, ranging 

 in price from $1 to Si.f^ '^er yard. 

 These goods are adapte °°'^s^Sfo^^ 

 made suits, are of remarkabie 

 and not to be found elsewhere. 



We would announce tluit we have 



secured the American Af/ency 



for the Quarterly' 



JOURNAL OF MICROSCOPY AND 

 NATURAL SCIENCE: 



The 



BROADWAY AND ELEVENTH STREET, 



NEW YORK. 



OFWHATUSEISTHATPLANT? 



You can find the answer in 



SMITH'S "DICTIONARY OF 

 ECONOMIC PLANTS." 



Sent postaid on receipt of $2.80. Publish- 

 er's price, §3.50. 



SCIENCE BOOK AGENCY, 



47 tafayette Place, Ne^v York. 



WORCESTER POLYTECHNIC INST!- 



TIITC Courses in Civil, Mechanical and Electri- 

 I U I £ cal Engineering and Chemistry, A new 

 Course in Physical and Political Science proposed. 

 For catalogue address H. T. Puller, Ph.D., Worces- 

 ter, Massachusetts. 



Michigan, Houghton. 



iichigan iVlining School. 



A State School of Surveying. Mining. Electri- 

 cal and Mechanical Engineering, Physics, Chemis- 

 try, Assaying, Ore Dressing, Mineralogy, Fetro- 

 graphy, Geology, Drafting, Machine Design, etc. 

 Tuition free. For catalogues and information ad- 

 dress 



M. E. Wadsworth, A.m., Ph.D., Director. 



THE JOURNAL OF 



Postal IVIIcrosGopical 

 Society. 



EDITED BY 



ALFRED ALLEN and WILLIAM 

 SPIERS, M.A., F.G.S., Etc. 



$1 .75 Per Year. 



CONTENTS OF JULY NUMBER. 



Bacteria; a Study in Biology. 



The New Apochromatic Lens. 



Our British Plants. 



Microscopic Fauna of Kennett and Avon Canal 



Intelligence of Ants. 



On the Presence of a Tarsal Comb in Spiders. 



Paper. 



The Trees of the Wood. I. — Beech. 



Colorless Preparations of Plants. 



Dips into my Aquarium. 



Differential Staining of Saccaromyces. 



Among the Fylde Flowers — The Woodlands. 



Pencil for Writing on Glass. 



Aspect of the Heavens. 



Paste for Mounting Botanical Specimens. 



The Pine Destroyer. 



Wesley Naturalists' Society. 



Reviews. 



THE TOSTAL 

 MICROSCOPICAL SOCIETY 



PRESIDKNT, 1889-90: 

 The Rev. H. W. LETT, M.A . T.C.D., Aghaderg 



Glebe, Lougbbrickland, Ireland. 



Virii-PIIIESIDEKT ANB PRESIBENT- 



EILECT: 



B. BARTLEET, 72 Warleigh Road, 



Brighton. 



PATRONS: 



JRACE THE DUKE OF ARGTLE. 



Sir JUiiN LUBBOCK, Bart., P.R S., P.E.M.S., 



The Rev. W. H. DALLINGEE, LL.D., F.R.S., 



F.RM.S., F.L.S. 



Dr. LIONEL S. BEALE, F.B.S., F.R.M.S., Etc. 



Dr. JABEZ HOGG, F.R M S , Etc. 



J. W. GROVES, Esq.. P.R. M.S., Etc. 



HON. SECRETARY: 



ALFRED ALLEN, 1 Cambridge Place, Bath, Eng. 



The Society was formed in 1873 to aid in 

 the study, discussion and circulation of Mi- 

 croscopic objects, and to advance the pursuit 

 of Natural Science among its members. 



It is divided into Circuits of about twelve 

 members each, arranged geographically. A 

 box of Slides accompanied by MS. book for 

 the insertion of Notes and Memoranda, is 

 sent by the Hon. Secretary, at fortnightly 

 intervals, to the first member on one of the 

 Circuits ; who, after iieeping it for three 

 days, must send it on by post to the next on 

 the list, and he to the following one. When 

 it has gone round the Circuit the last mem- 

 ber returns it to the Hon. Secretary, who 

 will then forward it to the first member of 

 the next Circuit, and so on, until the Slides 

 have been seen by the whole of the Society. 

 Each member is expected to contribute six 

 Slides annually, which are returned to him 

 after they have been around the Circuits. 

 Ladies, as well as gentlemen, may be elected 

 members of the Society. 



All communications on matters connected 

 with the Society should be addressed to Mr. 

 Alfred Allen, as above . 



N, D. C. HODGES, 47 Lafayette Place, N.Y. 



''«0 io//''«9/ 



THE MUTUAL LIFE 



INSURANCE COMPANY 

 OF NEW YORK. 



RICHARD A. McCURDY, President. 



THE LARGEST, BEST AND MOST POPULAR 



LIFE INSURANCE COMPANY IN 



THE WORLD. 



Assets January ist, 1890, $136,401,328.02 

 New Business in 1889, - 151,602,483.37 

 Annual Income, - - - 31,119,019.62 



Purely Mtchial. 



No Stockholders. 



NO OTHER COMPANY HAS SHOWN 

 RESULTS SO PROFITABLE AND GRAT- 

 IFYING TO POLICY-HOLDERS. 



ITS POLICIES ARE THE MOST 



LIBERAL AND DESIRABLE 



ISSUED. 



It has Paid Policy-holders since Organization 

 $287,681,948.20. 



The Twenty Year Distribution Policy 



issued by The Mutual Life Insurance 



Company is a Model Contract. 



The Company's Policie are now held by 

 182,310 Members. 



ESTERBROOK'S 

 STEEL PEi^S. 



Ot SUPERIOS AND STANDARD QUALITY. 

 Leading Nos.; 048,14,130, 135, 239, 333 



For Sale by all Stationers, 



THE ESTERBROOK STEEL PEN CO., 



Works : Camden. N. J. '26 John St.. New York. 



3e* r^ 3E3 IB. 



OUR 100 PP. CATALOGUE OF MliVBRAIiS. 



Illustrated with 57 cuts, and containing (a) Scien- 

 tific Papers and Notes, 41 pp.; (b) A Classified Lisfe 

 of All Mineral Species, giving chemical composition 

 and cryst allograph ic form, 31 pp.; (c) An Alpha- 

 betical Index of some 3,000 mineralogical names. 

 Paper-bound copies free to those mentioning this 

 journal ; handsome cloth-bound copies, 25 cents, 

 postpaid. GEO. L. ENGLISH & CO., Dealers in Min- 

 erals, 1512 Chestnut street, Philadelphia ; 739 & 741 

 Broadway, New York. 



