Miscellaneous Intelligence. 165 
reagan. ae vt sound ; for the predeane of heat; for illumina- 
and uses in light- houses and s signals ; for mines, , railro ads and 
and surgery; in astronomy, "meteorology ai. bac In agri- 
culture ; for registering purposes ; for working various adh of 
industrial machines, and for Sinicetie uses. 
Lightning rods. Collections of apparatus illustrating the his- 
tory of the subject and its applications from the earliest: times. 
Collections of books and memoirs pertaining to the science and to 
electrical industry. 
connection with the exposition, an International Congress of 
Electricians will be opened se the ae of September, under the 
aap of Minister Ap. HER 
. story %. the Jutties. at the Mouth of the Mississippi 
River ; ‘s E. L. Cortuets, C.E., Chief yaya sea resident 
Engineer ate ‘their construction. 383 pp. 8 numerous 
plates and ma ups. New York: 1880. (John “Wiley + Sons).— 
This volume gives a detailed history of the construction of the 
eee) jetties by Mr. James B. Eads, from the time when 
as first proposed until its final completion. The account 
is wetteen ¢ in popular style, and will be read with interest even by 
those who have no knowledge of the scientific pone sey ee 
in the work. The excellence of the scheme as a w s been 
proved by the success finally attained, and the a ee and 
enterprise with which it was carried forward in the face of dis- 
Mr. Eads, to whom the success of the esi is most of all due, 
orms a froutinpiees to the volume. 
s 
OBITUARY. 
An announcement of the death of M. CHasiEs appeared in the 
January number of this Journal. It occurred on the 18th of 
December last, in his 88th year, he having been born x gh 15th 
of November, 1793. It is nearly seventy years since the first 
Correspondence ; and his scientific activity has continued into 
the last year of his long life. 
The larger works of M. Chasles are five in number: Apergy 
orique sur I Origine et le Développement des Méthodes en 
Geomitre, Traité de Géométrie Supérieure, Traité des Sections 
Coniques, Les trois livres des Porismes @ Euclid, aA Rapport sur 
