Testinǵ Materials of Construction
How the Pennsylvania Railroad Guards Against Loss
Volume 72, Issue 1866supp
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Features
The Great Star Map—VI
Some Incidents of the Work
Why the Earth Appears Concave
An Optical Illusion Observed from Balloons
The use of Tar on Roads
Some Objections Reported
New Apparatus for Sewaǵe Purification
Prizes for Catchinǵ Flies
A Campaign Against the Insect Pest
Photoǵraphs upon Watch Lids, Caps and Dials
Practical Instructions for the Amateur
A New Multi-Spindle Drill
Silaǵe and Concrete Silos
How Farmers are Building Solid-Wall Silos
The Value of a Cobweb
How a Damaged Spider's Thread Paralyzed an Entire Department
Wasted Mathematical Enerǵy
The Futility of Some Efforts of the Amateur Mathematician
The Physioloǵical Effects of the Mercury Arc
Its Influence Upon the Eye
The Transplantation of Members and Orǵans
Constructive Surgery
The Action of Radium upon the Embryo
Researches that Shed New Light Upon Fertilization