To conclude: we regard the exhibitions now so common under the name of electro-biology as delusions, so far as they are understood to have any connection with the facts of electricity; so far as they are _real_, we regard them as very remarkable instances of a mode of acting on the brain which is, we believe, likely to prove injurious. As we have no motive in writing but simply to elicit the truth, we will briefly notice two difficulties which seem to attend our theory. These are--1. The _rapid transition_ from the state of illusion to an apparently wakeful and normal condition of mind. The patient who has been making snow-balls in a warm room, and has pulled the moon down, comes from the platform, recognises his friends, and can laugh at the visions which to him seemed realities but a few minutes since. 2. The _apparently slight effects_ left, in some cases, after the experiments. Among the subjects whom we have questioned on this point, one felt 'rather dizzy' all the next day after submitting to the process; another felt 'a pressure on the head;' but a third, who was one of the most successful cases, felt 'no effects whatever' afterwards; while a fourth thinks he derived 'some benefit' to his health from the operation. We leave these points for further inquiry. FOOTNOTES: [4] We can corroborate the view taken by the writer of this article as to the reality of the effects produced on the persons submitting to the process, having seen many who are intimately known to us experimented on with success. The incredulity which still prevails on this subject in London can only be attributed to the necessary rarity, in so large a town, of experiments performed on persons known to the observers.--ED. NEW MOTIVE-POWER.