[Gk. geranos, a crane.] A genus of plants with seed-vessels like a crane's bill. Most of them have showy flowers and a pungent odor. This group includes the commonly cultivated "geraniums " (Pelargoniums) which are mostly natives of South Africa. derm. [Fr., from L.germen, a sprout.] The first form of anything living, from which the egg and the embryo develop. Disease germs are minute spores or organisms called bacteria, bacilli, and microbes, which are now known to cause disease. Most forms of microbes are healthful and many of them very useful, the hurtful species being few in number. Dr. Frankland found 20,222 microbes in one cubic centimetre of Thames water, and alter filtration 401 in the same quantity of water. In the air after high winds germs are numerous, but after rain their number is 6mall. Bacillus is a long rod form and bacterium a smaller rod form of germ.