Experimental researches on the propagation of heat by conduction in bone, brain-tissue and skin / by J.S. Lombard ; communicated by Dr. Brown-Séquard.

  • Lombard, J. S.
Date:
[1882]
Catalogue details

Licence: Public Domain Mark

Credit: Experimental researches on the propagation of heat by conduction in bone, brain-tissue and skin / by J.S. Lombard ; communicated by Dr. Brown-Séquard. Source: Wellcome Collection.

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    propagation of heat by conduction is not rectilinear, a slight alteration of texture or composition might easily deflect the path of transmission in such a way as to wholly change the relative temperatures of the outer surface which we have given. Differences of thickness, also small, but sufficient to overthrow our calculations—may exist. Lastly, the circulation of the blood, already alluded to, although incapable of checking the outward transmission, might yet, within such narrow limits, bring about a confusion in the external manifestations of the interior change of temperature. It is only when areas of much greater dimensions—for instance, of 50 or 60 millims. square —are taken, that we can look with any degree of confidence to the relative external temperatures as furnishing a key to the relative temperatures of the underlying tracts of cerebral surface.* Moreover, in increased mental activity—whatever may be its kind—the change of tempera¬ ture on the outer surface of the head is of widespread extent, and not confined to such limited areas as those on which our calculations are based. *' See the writer’s “ Regional Temperature of the Head,” pp. 119 and 209. HARRISON AND SONS, PRINTERS IN ORDINARY TO HER MAJESTY, ST MARTIN’S LANE.
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