text:  The following will give a fair specimen of the conclusion to which such reasoning tends:-- "Indeed if we lay to heart the deceptiveness and mutability of all the external species of matter at the same time considering that we have no reason to deem it capable of change in its ultimate and imperceptible particles; if also we reflect that whatever is not palpable in itself is yet indicated by its effects forces us on pure reason by withdrawing at once the aid and the illusion of our external senses we shall perhaps come to the conclusion that the Invisible is the only true exclaiming with the old Latinist 'Invisibilia non decipiunt