This is a preliminary report and outline of the forms to be included in a comprehensive study of various spores and pollen grains from Carboniferous fructifications. A large number of reproductive ...

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_409278 ...

Researchers at the University of Illinois at Urbana-Champaign have shown for the first time that expensive aberration-corrected microscopes are no longer required to achieve record-breaking ...