3oo OF THE EXTERNAL SENSES.

tangible objefts which furround them. We may of-ten fee them, accordingly, by the ftraightefl road,rnn to and pick up any little grains which Hiefiions them, even at the diflan ce of feveral yards ;and they no fooner come into the light than theyfeem to underhand this language of Vifion as wellas they ever do afterwards. The young of thepartridge and of the groufe feem to have, at thefame early period, the moft diftinA perceptionsof the fame kind. The young partridge, almoftas foon as it comes from thefhell, runs about amonglong grafs and corn ; the young groufe amonglong heath, and would both moft effentially hurtthemfelves if they had not the moft acute as wellas diftin£l perception of the tangible objecls whichnot only furround them but prefs upon them onall fides. This is the cafe too with the young ofthe goofe, of the duck, and, fo far as I havebeen able to obferve, with thofe of at leaft thegreater part of the birds which make' their neftsupon the ground, with the greater part of thofewhich are ranked by Linnæus in the orders of thehen and the goofe, and of many of thofe long-flianked and wading birds which he places inthe order that he diftinguiflies by the name ofGrallæ.

The young of thofe birds that build their neftsin bullies, upon trees, in the holes and crevices ofhigh walls, upon high rocks and precipices, andother places of difficult accefs ; of the greater partof thofe ranked by Linnæus in the orders of thehawk, the magpie, and the fparrow, feem to come