Another sign of his mental decay was the weakness with which he now began to theorize. He accounted for everything by electricity. A singular mortality at this time prevailed amongst the cats of Vienna, Basle, Copenhagen, and other places. Cats being so eminently an electric animal, of course he attributed this epizootic to electricity. During the same period, he persuaded himself that a peculiar configuration of clouds prevailed; this he took as a collateral proof of his electrical hypothesis. His own headaches, too, which in all probability were a mere remote effect of old age, and a direct one of an inability [Footnote: Mr. Wasianski is quite in the wrong here. If the hindrances which nature presented to the act of thinking were now on the increase, on the other hand, the disposition to think, by his own acknowledgment, was on the wane. The power and the habit altering in proportion, there is no case made out of that disturbed equilibrium to which apparently he would attribute the headaches. But the fact is, that, if he had been as well acquainted with Kant's writings as with Kant personally, he would have known, that some affection of the head of a spasmodic kind was complained of by Kant at a time when nobody could suspect him of being in a decaying state.] to think as easily and as severely as formerly, he explained upon the same principle. And this was a notion of which his friends were not anxious to disabuse him, because, as something of the same character of weather (and therefore probably the same general tendency of the electric power) is found to prevail for whole cycles of years, entrance upon another cycle held out to him some prospect of relief. A delusion which secured the comforts of hope was the next best thing to an actual remedy; and a man who, in such circumstances, is cured of his delusion, '_cui demptus per vim mentis gratissimus error_,' might reasonably have exclaimed, '_Pol, me occidistis, amici._'