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bait will be taken by humans, pets, or domestic animals to cause adverse effects. Out of the several hundred nation-wide tests made on Warfarin, no case of accidental human poisoning was reported.
Dwarf Galaxies May Throw Light on Evolution of Star Systems.--The National Geographic Society-Palomar Observatory Sky Survey recently announced the discovery of two new dwarf stellar systems in the Constellation of Leo, one of which is the smallest ever found. The announcement was made in a paper by R. G. Harrington and Dr. Albert G. Wilson which was read at a meeting of the Astronomical Society of the Pacific in Salt Lake City, Utah.
The new systems are additions to what is known as our "local" group of galaxies and bring to 16 the number now included in the group. The so-called "local" group is one of which our own galaxy, or Milky Way, is a member.
Sky Survey plates made in April of this year (1950) by the 48-in. Schmidt camera at the Palomar Observatory revealed the two new stellar systems.
The discoveries are significant because of the fact that further study of these new systems of stars may throw new light on the stability and perhaps the evolution of nebulae. This is particularly true of the one which is smaller than any heretofore known, since its discovery indicates that there is reason to assume that eventually galaxies of even smaller mass and size may be found. If this proves true, then there may be new evidence gained as to how huge island universes like our own Milky Way evolved. Heretofore the smallest known galaxies had a diameter of about 3,000 light years as compared to 1,500 light years for the smallest of the new ones.
It will be another year before additional work can be done on these new systems since they are now in a poor position for observation. However, when they are again in good position, large telescopes like the 200-in. Hale at Palomar and the 100-in. at Mt. Wilson will undoubtedly be turned on them in search of more detailed information.
It will then be possible to obtain more complete data on their velocity, luminosity and mass, since they are close enough to be resolved into individual stars. It is out of this added information, which might require several years to accumulate and evaluate, that astronomers may get new clues as to the stability and evolution of all stellar systems.
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