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extremely rapid movements reproduce themselves only by splitting up into two or three without the intervention of chromosones. With regard to the intervention of the chromosones, in figures 3, 4 and 5 can be seen cultures of cells coloured with hematoxiline which show the formation of chromosones in various stages of growth. In the film it is especially interesting to observe the phenomena produced and the movements of the cells. When a cell prepares to divide itself, it loses part of its activity and becomes round. The equatorial plane can be seen forming, round which the chromosones gather, tending to break up
and then through a greater activity . &
of the cell the division takes place. lM
If one of the edges of the cultures is J '1 •* :'),
placed in the field of visibility, the cC
cell will be seen to leave it in a few ... Hb
hours. The increase does not only take place through self-division, because each new cell increases in volume.
As to the influence of chemical substances on isolated cells, Horteg
a's cells in culture have provided us with an admirable subject for purposes of study. Costero (1) has explained very well why we must give up the idea of probing the details of the activity, charactertistics and importance of these cells in the special function they have in the life of the nerves and the brain. In addition to their mobility, Hortega's cells undergo notable changes in their shape, accompanied by the formation of pseudopedicel appendices around the body. Under the microscope, these appendices seem like lashes moving in every direction. Slow motion micro-cinematography has succeeded in giving us some indications of their real nature.
In the successful photograms, we see that the body of these cells is surrounded by a fragile membrane of almost equal diameter with the cell, which it propels through undulatory movements. In numerous points, this membrane splits producing the eye-lash effect. The phenomenon is quite different from that of the pseudopedicels of the amoebae and the 1 ashes of bacteria.
(1) CoSTERO. Studien an Mikrogliazellen {Hortegazzelen) in GeWebskulturen von Gehern. Arb. a-d Staatinstitut.