In the illustration the reader will observe the flat, fan-like expansions at the ends of the toes, by which the Gecko is able to adhere to flat surfaces, and to dart with silent rapidity from place to place. [Illustration: serpent] [Illustration: serpents] SERPENTS. Serpents in general--The fiery Serpents of the wilderness--Explanation of the words "flying" and "fiery" as applied to Serpents--Haunts of the Serpent--The Cobra, or Asp of Scripture--The Cerastes, or Horned Serpent--Appearance and habits of the reptile--The "Adder in the path." As we have seen that so much looseness of nomenclature prevailed among the Hebrews even with regard to the mammalia, birds, and lizards, we can but expect that the names of the Serpents will be equally difficult to identify. No less than seven names are employed in the Old Testament to denote some species of Serpent; but there are only two which can be identified with any certainty, four others being left to mere conjecture, and one being clearly a word which, like our snake or serpent, is a word not restricted to any particular species, but signifying Serpents in general. This word is _nâchâsh_ (pronounced nah-kahsh). It is unfortunate that the word is so variously translated in different passages of Scripture, and we cannot do better than to follow it through the Ola Testament, so as to bring all the passages under our glance. The first mention of the Nâchâsh occurs in Gen. iii., in the well-known passage where the Serpent is said to be more subtle than all the beasts of the field, the wisdom or subtlety of the Serpent having evidently an allegorical and not a categorical signification. We find the same symbolism employed in the New Testament, the disciples of our Lord being told to be "wise as serpents, and harmless as doves." Allusion is made to the gliding movement of the Serpent tribe in Prov. xxx. 19. On this part of the subject little need be said, except that the movements of the Serpent are owing to the mobility of the ribs, which are pushed forward in succession and drawn back again, so as to catch against any inequality of the ground. This power is increased by the structure of the scales. Those of the upper part of the body, which are not used for locomotion, are shaped something like the scales of a fish; but those of the lower part of the body, which come in contact with the ground, are broad belts, each overlapping the other, and each connected with one pair of ribs.