I was the victim of a very curious illusion to-day. On our small
heating stove stands a cylindrical ice melter which keeps up the
supply of water necessary for the dark room and other scientific
instruments. This iron container naturally becomes warm if it is not
fed with ice, and it is generally hung around with socks and mits which
require drying. I put my hand on the cylindrical vessel this afternoon
and withdrew it sharply with the sensation of heat. To verify the
impression I repeated the action two or three times, when it became
so strong that I loudly warned the owners of the socks, &c., of the
peril of burning to which they were exposed. Upon this Meares said,
'But they filled the melter with ice a few minutes ago,' and then,
coming over to feel the surface himself, added, 'Why, it's cold,
sir.' And indeed so it was. The slightly damp chilled surface of the
iron had conveyed to me the impression of excessive heat.
There is nothing intrinsically new in this observation; it has often
been noticed that metal surfaces at low temperatures give a sensation
of burning to the bare touch, but none the less it is an interesting
variant of the common fact.
Apropos. Atkinson is suffering a good deal from his hand: the frostbite
was deeper than I thought; fortunately he can now feel all his fingers,
though it was twenty-four hours before sensation returned to one
of them.
Pages:
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384