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The attack, however, may be less sudden and, not infrequently, attended by a convulsion; while occasionally, in the condition termed ingravescent apoplexy, the coma is gradual in its onset, occupying hours in its development.

It is the sudden shock to the delicate mechanism that produces the unconsciousness; but seeing that the coma is usually deeper and more prolonged in cerebral haemorrhage than when occasioned by vascular occlusion, and that an ingravescent apoplexy coma gradually develops and deepens as the amount of haemorrhage increases, we may presume that increase of intracranial pressure does play an important part in the degree and intensity of the coma caused by the rupture of a vessel.