"The manner in which "this great man arrived to discover so much of magnetical philosophy" and "all the knowledge he got on this subject," we are told by Sir Kenelm Digby, "was by forming a little load-stone into the shape of the earth. By which means he compassed a wonderful designe, which was, to make the whole globe of the earth maniable; for he found the properties of the whole earth, in that little body; which he therefore called a terrella, or little earth; and which he could manage and try experiences upon, at his will. And in like manner, any man that hath an aim to advance much in natural sciences, must endeavour to draw the matter he enquireth, of into some small modell, or into some kinde of manageable method; which he may turn and wind as he pleaseth. And then let him be sure, if he hath a competent understanding, that he will not misse his mark.""