Dam Across the Ottawa River, and New Canal at Carillon,
Quebec. Several figures and map.

II. ARCHITECTURE.--Dwelling Houses.--Hints on building. By
WILLIAM HENNAN.--Considerations necessary in order to have-
thoroughly sweet homes.--Experiment illustrating the necessity
of damp courses.--How to make dry walls and roofs.--Methods of
heating.--Artificial lighting.--Refuse.--Cesspools.--Drainage

House at Heaton.--Illustration.

A Mansard Roof Dwelling. 2 figures.

III. ELECTRICITY.--The History of the Electric Telegraph.--Documents
relating to the magnetic telegraph.--Apparatus of Comus
and Alexandre.--Origin of the electric telegraph.--Apparatus of
Lesage, Lemond, Reveroni, Saint Cyr, and others.--Several figures.

Electrical Transmission and Storage.--By DR. C. WM. SIEMENS.

III. MEDICINE AND HYGIENE.--Malaria. By Dr. JAMES SALISBURY.--VII.
Report on the cause of ague.--Studies of ague plants
in their natural and unnatural habitats.--List of objects found in
the Croton water.--Synopsis of the families of ague plants.--
Several figures.

Ichthyol.

Autopsy Table. 1 figure.