Nature . The lens is anachromatic otbest quality withIris Diaphragm. nged for t be regu JAMES WOOLLEY, SONS & CO., VICTORIA BRIDGE. MANCHESTER. Complete Catalogue on application. NEGRETTI & ZAMBRAS. IMPROVED SELF-RECOROINO RAIN GAUGE. DESCRIPTIVE PRICE LIST POST FREE. INVENTEh AMI MADE ONLY BY NEGRETTI & ZAMBRA, Scientific Instrument Makers to Her Majesty the Queen,38 HOLBORN VIADUCT, Branches—45 , , and 122 Regent Street, W. NA TURE [AlRIL 27, 1899 ROYAL INSTITUTION OFGREAT BRITAIN, ALBEMARLE STREET, PICCADILLY, W. TUESDAY next (May 2), at Three oclock, Prof. Silvanus


Nature . The lens is anachromatic otbest quality withIris Diaphragm. nged for t be regu JAMES WOOLLEY, SONS & CO., VICTORIA BRIDGE. MANCHESTER. Complete Catalogue on application. NEGRETTI & ZAMBRAS. IMPROVED SELF-RECOROINO RAIN GAUGE. DESCRIPTIVE PRICE LIST POST FREE. INVENTEh AMI MADE ONLY BY NEGRETTI & ZAMBRA, Scientific Instrument Makers to Her Majesty the Queen,38 HOLBORN VIADUCT, Branches—45 , , and 122 Regent Street, W. NA TURE [AlRIL 27, 1899 ROYAL INSTITUTION OFGREAT BRITAIN, ALBEMARLE STREET, PICCADILLY, W. TUESDAY next (May 2), at Three oclock, Prof. Silvanus , First of Two Lectures on Electric Eddy-Currents (the Tyndall Lectures). the Course. THURSDAY (May 4), at Three oclock, Lewis F. Day, Esq. Firstof Three Lectures on Embroidery. Half-a-Guinea the Course. SATURDAY (May 6), at Three oclock, W. L. Brown, Esq., , S. First of Two Lectures on To Iceland in Search of Health <with Lantern Illustrations). Haifa-Guinea the Course. Subscription to all Courses of Lectures in Season, Two Guineas. ZOOLOGICAL SOCIETY OF LONDON. A COURSE of EIGHT POPULAR LECTURES on AgUATICMAMMALS will be delivered in the


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