PSEUDONEUROPTERA n.
division of insects (Zoöl.) reticulated wings, as in the Neuroptera, but having an active pupa state. It includes the dragon flies, May flies, white ants, etc. By some zoölogists they are classed with the Orthoptera; by others, with the Neuroptera.
RADIUM n.
An intensely radioactive metallic element found (combined) in minute quantities in pitchblende, and various other uranium minerals. Symbol, Ra; atomic weight, 226.4. Radium was discovered by M. and Mme. Curie, of Paris, who in 1902 separated compounds of it by a tedious process from pitchblende. Its compounds color fla…