V. CIVIL ENGINEERING.--The Lock of the Dortmund-Ems Canal
at Henrichenburg.--1 illustration 18776
VI. ELECTRICITY.--The Development of the Central Station--By
SAMUEL INSULL 18774
VII. MARINE ENGINEERING.--Steering Gear of North German
Lloyd Steamers "Coblentz," "Mainz" and "Trier."--2
illustrations 18777
VIII. MEDICINE AND HYGIENE.--Sleep and the Theories of its
Cause 18768
IX. MISCELLANEOUS:
Engineering Notes. 18771
Electrical Notes. 18771
Selected Formulæ. 18771
X. NATURAL HISTORY--Wild and Domestic Sheep in the Berlin
Zoological Garden.--8 illustrations 18772