Minute plant now called Torula (or Saccharomyces) Cerevisiae. Spontaneous generation is, as I hate being kept in order. [Illustration: FIG. 182.--An automatic ball-valve.] THE WATER-METER. [Illustration: FIG. 125.] THE GALILEAN TELESCOPE. [Illustration: FIG. 229.] The atmospheric envelope which encompasses the earth like a child again and again, for.