The Decay of Building the Stones. By Dr. A. A. JULIEN.--The
building stones, their varieties, localities, and edifices
constructed of each.--Durability of building stones in New
York and vicinity.--Methods of trial of building stone.--
Means of protection and preservation of stone 6447
V. ELECTRICITY.--The History of the Electric Telegraph.--
First use of the Volta pile in telegraphy.--Description of
Soemmering's apparatus.--With two engravings 6446