The following is an offshoot from a more extended investigation upon the coagulation of the blood not yet ready for publication. The blood flowing from a leech-bite is not readily stopped, often flowing for upwards of an hour after the animal has been removed. The blood with in the body of the creature remains fluid for an indefinite time; and when ejected it is found to have lost its coagulability. These are facts known to every surgeon, but they have received no explanation.
I propose to describe in this essay some experiments which I have conducted upon the limits in time of separate tactile and thermal sensibilities. I shall endeavour to account for the variations seen in the limitations in conscious sensation of the different senses; and also to formulate a general proposition as to the effect on consciousness of stimuli increasing gradually in rapidity of application.
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