El autor entiende que la ardilla voladora puede llegar a ser perfecta por acción de la selección natural. Otro ejemplo dogmático que recuerda el comentario de Thompson:   “This situation, where scientific men rally to the defence of a doctrine they are unable to define scientifically, much less demonstrate with scientific rigour, attempting to maintain its credit with the public by the suppression of criticism and the elimination of difficulties, is abnormal and undesirable in science.  “      …