The Initial Body and the Plaque Form in theChlamydozoaceae

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Abstract
Examination of electron micrographs of the agent of feline pneumonitis has demonstrated the existence of large bodies lying well outside the range of size found for the elementary bodies. Such large bodies form approx. 0.5% of all bodies studied. They are believed to represent initial bodies. It is also possible to demonstrate closely packed groups of elementary bodies which are presumed to represent the colonies of elementary bodies usually found in sections of infected yolk sac embedded in a "capsular" matrix to form the plaque. It is believed that the matrix itself is easily disintegrated and so disappears during preparation of the screens for the electron microscope, a thesis in accord with other observations.