BIOGRAPHY.--Alfred Tennyson.--Biographical note of the
great poet, now past his 80th year, with portrait.--1 illustration
Fiftieth Year of the Prince of Wales.--The Prince of Wales
and his family, with notes of his life and habits.--1 illustration
IV. CHEMISTRY.--American Association--Ninth Annual Report of
the Committee on Indexing Chemical Literature.--A very important
report upon the titular subject, with probabilities of future advance
in this line.--The chemical index of the SCIENTIFIC
AMERICAN and SUPPLEMENT
Apparatus for the Estimation of Fat in Milk.--By E. MOLINARI.--
Details of a method of determining fat in milk, with illustration
of the apparatus employed
Further Researches upon the Element Fluorine.--By A.E. TUTTON.--
Additional researches upon this element, following up
the work outlined by M. MOISSAN.--3 illustrations
The Allotropic Conditions of Silver.--A recent letter from M.
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