THE author of this convenient and systematic little treatise is Demonstrator of geology in the Imperial College of Science, London, where he has gained experience through the introduction of large I ...

WHEN public interest in the curiosities of science was widespread, some fifty years ago, the possession of a microscope was a social necessity. The instrument to-day is no longer the popular plaything ...

Table of metric and English measures and table of natural sines on lining-papers. siris_sil_115192 ...

A microscope is a scientific instrument used to magnify small objects so they can be seen larger than life. The simplest microscope is a single lens called a magnifying glass. The larger, more ...