Various forms of perverted nerve function may be found co-existing with or following neuralgia.
The Apostolic tradition might have been perverted and corrupted.
But when men set themselves to cultivate skill in disputation, regarding the matter discussed not as a serious issue, but as a thesis upon which to practise their powers of controversy, they learn to pursue, not truth, but victory; and, their criterion of excellence having been thus perverted, they presently prefer ingenious fallacy to solid reasoning and the applause of bystanders to the consciousness of honest effort.
That is to say, Grote supposes that for at least eight and forty years, from 447 to 399, the paid professors had no professional title; that, this period having elapsed, a youthful opponent succeeded in fastening an uncomplimentary title not only upon the contemporary teachers, but also, retrospectively, upon their predecessors; and that, artfully enhancing the indignity of the title affixed, he thus obscured, perverted and effaced the records and the memories of the past.
This picture is obviously inverted, and also perverted, for not only are objects depicted lower the higher they are, but also objects seen to the right are depicted to the left, &c. But it will be seen unperverted (though still inverted) if it be received on a sheet of ground glass and looked at from behind.