Nature of Drawn into the Drawn in, by or Drawn in, by or Object. burrows, by or near the near the base. near the apex. middle. Leaves of 80 11 9 various kinds —of the Lime, 79 17 4 basal margin of blade broad, apex acuminated —of a Laburnum, 63 10 27 basal part of blade as narrow as, or sometimes little narrower than the apical part —of the 34 ... 66 Rhododendron, basal part of blade often narrower than the apical part —of Pine-trees, ... ... 100 consisting of two needles arising from a common base Petioles of a 76 ... 24 Clematis, somewhat pointed at the apex, and blunt at the base —of the Ash, 48.5 ... 51.5 the thick basal end often drawn in to serve as food —of Robinia, 44 ... 56 extremely thin, especially towards the apex, so as to be ill-fitted for plugging up the burrows Triangles of 62 15 23 paper, of the two sizes —of the broad 59 25 16 ones alone —of the narrow 65 14 21 ones alone If we consider these several cases, we can hardly escape from the conclusion that worms show some degree of intelligence in their manner of plugging up their burrows. Each particular object is seized in too uniform a manner, and from causes which we can generally understand, for the result to be attributed to mere chance. That every object has not been drawn in by its pointed end, may be accounted for by labour having been saved through some being inserted by their broader or thicker ends. No doubt worms are led by instinct to plug up their burrows; and it might have been expected that they would have been led by instinct how best to act in each particular case, independently of intelligence. We see how difficult it is to judge whether intelligence comes into play, for even plants might sometimes be thought to be thus directed; for instance when displaced leaves re-direct their upper surfaces towards the light by extremely complicated movements and by the shortest course. With animals, actions appearing due to intelligence may be performed through inherited habit without any intelligence, although aboriginally thus acquired. Or the habit may have been acquired through the preservation and inheritance of beneficial variations of some other habit; and in this case the new habit will have been acquired independently of intelligence throughout the whole course of its development. There is no _à priori_ improbability in worms having acquired special instincts through either