Abstract
The strychine spike was recorded under constant conditions in 70 immature rabbits distributed over the first postnatal month. The following conclusions appear justified: 1. 1. The strychnine spike has already acquired its mature triphasic form at birth. However, it has an extremely long duration in comparison with the highly synchronized adult spike; and very long intervals occur between. 2. 2. Between 1 and 30 days the increase in synchronization of the strychnine spike approximates an exponential curve. Increase in frequency of spikes approximates an S-shaped curve. 3. 3. The most rapid postnatal change in duration of the strychnine spike correlates histologically with the early phase of maturation of the axonal and dendritic plexuses of the cortex and definitely precedes the first appearance of myelin, even in the internal capsule and subcortical white matter. 4. 4. A discrepancy was observed between the time myelin was first detected by the Weil modification of the Weigert method and by the polarized light method. This was attributed to the myelin acquiring its stainaibility by hematoxylin before it acquires its doubly refractile character.
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