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183 ORDER THROUGH FLUCTUATIONS<br />

If this number is small compared with the total number of larvae, the cluster<br />

fails to develop (Figure D). If it is large, the cluster grows (Figure E). For<br />

intermediate values of the initial nucleus, new types of structure may develop:<br />

Two, three or four other clusters appear and coexist, with a time of life<br />

at least greater than the time of observation (Figures F and G).<br />

No such multicluster structure was ever observed in experiments with homogeneous<br />

initial conditions. It would seem they correspond, in a bifurcation<br />

4)<br />

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Figure B. Self-aggregation at low density. The times are 0 minutes and 22<br />

minutes.

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