We will notice further examples of this use of the word a little later, in connection with book-titles. In "Troilus and Cressida" (Act II, Sc. 3) Thersites bursts into soliloquy before the tent of Achilles with: "How now, Thersites! What, lost in the labyrinth of thy fury!" Milton says that "Lethe, the river of oblivion, rolls her watery labyrinth," and Pope that "Love in these labyrinths his slaves detains"; but the occurrence of such expressions in writings of all periods is too common to need further quotation. We might perhaps point out that a slight shade of difference may be assumed to exist between "labyrinth" and "maze," even when these words are used in their metaphorical sense. We may take "labyrinth" to signify a complex problem involving merely time and perseverance for its solution, "maze," on the other hand, being reserved for situations fraught, in addition, with the elements of uncertainty and ambiguity, calling for the exercise of the higher mental faculties--in short, we may regard the two words as having reference respectively to the unicursal and multicursal types of plan (_see_ Introduction). A distinction of this kind adds point to a sentence like that which occurs, for instance, in Mr. Lytton Strachey's "Queen Victoria," where he tells us (p. 178) that the Prince Consort "attempted to thread his way through the complicated labyrinth of European diplomacy, and was eventually lost in the maze." As a means of expressing complexities of outline or of inner structure, natural or artificial, the word has been adopted by various branches of science or art. Every student of anatomy knows the "labyrinth" of the inner ear, every geological tyro has heard of those gigantic amphibians of Carboniferous to Triassic times whose peculiarly lamellated teeth have earned for them the title of "labyrinthodonts." Zoologists are acquainted with those lowly protoplasmic forms of life which, on account of the mazy net-like appearance assumed at one stage in their life-history, are called "labyrinthulidea." Even the engineer finds it convenient to make use of the word, as, for instance, when he speaks of a "labyrinth-packing" for turbines, an arrangement which allows a certain amount of lateral motion while ensuring steam-tightness. We may remark in passing that the names of the artificer Daedalus and of the winding river Meander have also done duty in scientific nomenclature in some cases where it was desired to commemorate labyrinthine characteristics; for example, a pretty little fungus allied to the _Stereum_ so common on decaying wood has received the generic title of _Daedalea_, on account of the mazy pattern displayed by its spore-bearing surface, while the beautiful "brain-stone" coral is known to the naturalist under the name of _Meandrina_.