II. ANTHROPOLOGY.--The Milestones of Human Progress 18766

III. BIOGRAPHY.--The Queen Regent and Alfonzo XIII.--1
illustration 18755

IV. BOTANY AND HORTICULTURE.--Rose Psyche--1 illustration 18768

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

XI. PATENTS.--Patents.--By JAMES W. SEE 18773