I answer, That though those Effects may be generally beneficial to most of the Creatures in this World; yet, not to all the Parts of the World: as for example, Though Light is beneficial to the Eyes of Animals; yet, to no other Part of an Animal Creature. And, though Darkness is obstructive to the Eyes of Animals; yet, to no other Parts of an Animal Creature. Also, Air is no proper Object for any of the Human Parts, but Respiration. So Cold and Heat, are no proper Objects for any Part of a Human Creature, but only the Pores, which are the Organs of Touch. The like may be said for Hard and Soft, Dry and Wet: and since they are not Fundamental actions of Nature, but Particular, I cannot believe, but that there may be such Worlds, or Creatures, as may have no use of Light, Darkness, and the like: for, if some Parts of this World need them not, nor are any ways beneficial to them, (as I formerly proved) surely a whole World may be, and subsist without them: for these Properties, though they may be proper for the Form or Species of this World; yet, they may be no ways proper for the Species of another kind or sort of World: as for example, The Properties of a Human Creature are quite different from other kinds of Creatures; the like may be of different Worlds: but, in all Material Worlds, there are Self-moving Parts, which is the cause there is self-joyning, uniting, and composing; self dividing, or dissolving; self-regularities, and self-irregularities: also, there is Perception amongst the Parts or Creatures of Nature; and what Worlds or Creatures soever are in Nature, they have Sense and Reason, Life and Knowledg: but, for Light and Darkness, Hot and Cold, Soft and Hard, Leight and Heavy, Dry and Wet, and the like; they are all but particular actions of particular Corporeal Species, or Creatures, which are finite, and not infinite: and certainly, there may be, in Nature, other Worlds as full of varieties, and as glorious and beautiful as this World; and are, and may be more glorious or beautiful, as also, more full of variety than this World, and yet be quite different in all kinds and sorts, from this World: for, this is to be noted, That the different kinds and sorts of Species, or Creatures, do not make Particulars more or less perfect, but according to their kind. And one thing I desire, That my _Readers_ would not mistake my meaning, when I say, _The Parts dissolve_: for, I do not mean, that Matter dissolves; but, that their particular Societies dissolve. APPENDIX TO THE GROUNDS OF Natural Philosophy. The FIRST PART. CHAP. I. Whether there can be a Substance, that is not a Body. What a _Substance_, that is not _Body_, can be, (as I writ in the First Chapter of this Book) I cannot imagine; nor, that there is any thing between _Something_ and _Nothing_.