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are aiven of this Saunderson, the blind Pro- .:.sssr 0. Mathematics Il, the Unisets .,f .f Cambridge, in England, became such connoisselu of ancient coins, that he could detect the modern counterteits, even when good eyes were puzzled about them. There lived q few years ago blind man in Aus tria, who executed very good hnsts by feel ing the faces of persons, and initiating them; and there is now a bust of the late Emperor, executed by this blind man and preserved in the Museum in Vienna, which IS considered very good likeness. Per sons wilu nave witnessed, exhibitions Ut tie Institutions for the Blind, have been sur prised at the ease and fueney with which they can read books printed in raised let ters, by passing the figures rapidly over them; this, however, IS by no means so ex- tY;sesdd:.naryy as many other instances which are notorious, though not well understood. d.- X blind man, for instance, when walking in perfect calm, can ascertain the proximity of objects by the feeling of the atmosphere upon his face; 1t would seem at first that the echo given back, were it only from his breathing, might be sensible to his ear; but we have ascertained by experiment, that a

 

 blind man with his ears stepepfel, eenld tell when any large object was close to his face, even when 1t was approached so slowly as not to cause any sensible current of air.

 It IS I common suppositIon that the bllnc can distinguish colors. but after much re- search we are convinced that this IS impos- sible; all the bind whom we have consul ted on the subject, have replied that they had no such power. and they did not be- ieve that any blind person ever had it. Hi IIfi- deed, what tangible quality can there be in q substance so ethereal that 1t passes un- obstructed through dense glass! There was an instance of girl ill England, who was generally believed to have this power; and the trials and tests which she success fully underwent. somewhat puzzled us, un- til an explanation of the difficulty offered itself in the chemical properties of the diff ierent colored rays of light. She could as- certain the eolors of different pieces of cloth by applying them to her lips in suc- eesslon; and she must have learned that some colors radiate heat more rapidly than others, so that she could tell white from black by the different degrees of warmth which 1t imparted to her lips. This Is per haps one of the most extraordinary instan- ces of nicety of touch which cafi be quoted. The same girl used to astonish ineredulous visitors by reading the large letters of the makers name written in their hats while they held them behind her back.