The ordinary criticisms of our senses only show that they have to be corrected by Reason, 117; more profound arguments show that the vulgar belief in external objects is baseless, and that the objects we see are nothing but perceptions which are fleeting copies of other existences, 118; even this philosophy is hard to justify; it appeals neither to natural instinct, nor to experience, for experience tells nothing of objects which perceptions resemble, 119; the appeal to the _veracity of God_ is useless, 120; and scepticism is here triumphant, 121. _The distinction between primary and secondary qualities_ is useless, for the supposed primary qualities are only perceptions, 122; and Berkeley's theory that ideas of primary qualities are obtained by abstraction is impossible, 122, 122 n; if matter is deprived of both primary and secondary qualities there is nothing left except a mere something which is not worth arguing about, 123. C. _As to Reason_, 124-130. Attempt to destroy Reason by reasoning extravagant, 124; objection to _abstract reasoning_ because it asserts infinite divisibility of extension which is shocking to common sense, 124, and infinite divisibility of time, 125; yet the ideas attacked are so clear and distinct that scepticism becomes sceptical about itself, 125. Popular objections to _moral reasoning_ about matter of fact, based on weakness of understanding, variation of judgement, and disagreement among men, confuted by action, 126; philosophical objections, that we only experience conjunction and that inference is based on custom, 127; excessive scepticism refuted by its uselessness and put to flight by the most trivial event in life, 128. Mitigated scepticism or academical philosophy useful as a corrective and as producing caution and modesty, 129; and as limiting understanding to proper objects, 130; all reasoning which is not either abstract, about quantity and number, or experimental, about matters of fact, is sophistry and illusion, 132. D. In _Religion_ (v. _Miracles_, _Providence_). Sciences 132 (v. _Reason_, (d); _Scepticism_, C). Secret powers, 39; counteracting causes, 47, 67. Senses outward and inward sensation supplies all the materials of thinking--must be corrected by reason, 117. Scepticism concerning, 117 (v. _Scepticism_, B). Similarity basis of all arguments from experience, 31 (cf. 115). Solidity 50; a supposed primary quality, 122. Soul and body, 52. Space and time, 124 f. Species an effect which belongs to no species does not admit of inference to its cause, 115 (cf. 113). Stoics 34, 79. Superstition 6 (v. _Providence_). Theology science of, 132 (v. _God_, _Providence_).