A motile **rodlet** with one cilium and with a spore formed inside.

Subtilis) - the axis of growth of the germinal **rodlet** is at right angles, to the long axis of the spore.

P, a **rodlet** in this condition (but divided into four segments) after treatment with alcoholic iodine solution.

R, a **rodlet** segmented in four, each segment containing one ripe spore.

The growth of an ordinary bacterium consists in uniform elongation of the **rodlet** until its length is doubled, followed by division by a median septum, then by the simul- Measure- taneous doubling in length of each daughter cell, again ment of followed by the median division, and soon (figs.

If a **rodlet** in a hanging drop of.

A **rodlet** appeared (A); at 4 P.M.

It takes any ordinary **rodlet** 30-40 minutes to double its length and divide into two equal daughter cells when growth is at its best; nearer the minimum it may require 3-4 hours or even much longer.