| Show FOR STUDENTS OF NATURE the toil of the fish waa the first rudder and also it may be added the first screw propeller anyone watching the movement of fishes tails while swimming will be struck with the resemblance to those of a screw propeller the first trap door was made by it species of african spider which has its nest in the ground and closes tha entrance by means of a trap door opening outwardly and covered with bits of earth and graas in order to escape observation the tailor wasp when needing a piece of leaf to line its nest always cuts its pattern in an exact circle these have often been watched but have never been known to mistake the eize to cut the pattern over again or to spoil a leaf the first hammer was a stone used by a monkey to crack nuts darwin in his story of the cruise of the tells of a monkey on board that vessel which used a atone for this purpose afterward concealing its implement in the straw of its cage |
