...you may lay severall egges to hatch; and by breaking them at severall ages you may distinctly observe every hourely mutation in them, if you please. The first will bee, that on one side you shall find a great resplendent clearnesse in the white. After a while, a little spott of red matter like bload, will appeare in the middest of that clearnesse fastened to the yolke: which will have a motion of opening and shutting; so as sometimes you will see it, and straight againe it will vanish from your sight; and indeede att the first it is so litle, that you can not see it, but by the motion of it; for att every pulse, as it openeth, you may see it, and immediately againe, it shutteth in such sort, as it is not to be discerned. From this red specke, after a while there will streame out, a number of litle (almost imperceptible) red veines. Att the end of some of which, in time there will be gathered together, a knotte of matter which by litle and litle, will take the forme of a head; and you will ere long beginne to discerne eyes and a beake in it. All this while the first red spott of blood, groweth bigger and solider; till att the length, it becometh a fleshy substance; and by its figure, may easily be discerned to be the hart: which as yet hath no other enclosure but the substance of the egge. But by litle and litle the rest of the body of an animal is framed out of those red veines which streame out all aboute from the hart. And in processe of time, that body incloseth the hart within it by the chest, which groweth over on both sides, and in the end meeteth, and closeth it selfe fast together. After which this litle creature soone filleth the shell, by converting into severall partes of it selfe all the substance of the egge. And then growing weary of so straight an habitation, it breaketh prison, and cometh out, a perfectly formed chicken.[5]