Chapter 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.