Testing Cement.--A laboratory process for testing Portland cement

III. CIVIL ENGINEERING.--The Compressed Air System of Paris.

--An elaborate review of this great installation for the transmission

of power.--The new compressed air station, with full details

of performances of apparatus, etc.--10 illustrations

IV. ENTOMOLOGY.--Report on Insects.--Continuation of this report

on noxious insects.--Their habits and how to cope with them.

--18 illustrations

V. FLORICULTURE.--Lily of the Valley.--Practical notes on the

cultivation of this popular flower.--How to raise it and force the

growth

VI. MATHEMATICS.--The Conic Sections.--By Prof. C.W.

MACCORD.--Examination of the four conic sections with a general

definition applicable to all.--6 illustrations

VII. MECHANICAL ENGINEERING.--The Builders of the Steam

Engine--The Founders of Modern Industries and Nations.--By Dr.

R.H. THURSTON.--Prof. Thurston's address before the Centennial

Celebration of the American Patent System at Washington,

D.C.--The early history of the steam engine and its present position

in the world

VIII. MISCELLANEOUS.--The Breeds of Dogs.--Popular description

of the different breeds of dogs most affected by amateurs.--6

illustrations

IX. NAVAL ENGINEERING.--Modern Armor.--By F.R. BRAINARD.--The

development of modern ship armor, from laminated

sandwiched and compound types to the present solid armor.--9

illustrations

X. PISCICULTURE.--Restocking the Seine with Fish.--The introduction

of 40,000 fry of California trout and salmon, designed to restock

the Seine, depopulated of fish by explosions of dynamite

used in breaking up the ice.--1 illustration

XI. RAILWAY ENGINEERING.--Improved Hand Car.--A novelty

in the construction of hand cars, avoiding the production of a

dead center.--1 illustration

XII. TECHNOLOGY.--The Tanning Materials of Europe.--The natural

tanning materials and pathological or abnormal growth tanning

materials described and classified, with relative power

* * * * *

Scientific American Supplement, No. 803, May 23, 1891 · 第 5 / 48 题