 Barry Stroud, in his 1968 article “Transcendental Arguments,” issued a formidable challenge to the enterprise of defeating the external-world skeptic by transcendental arguments of this sort (Stroud 1968). There Stroud contends that such transcendental arguments are undermined by a problem which can be stated quite generally. These arguments feature reasoning from some aspect of experience or knowledge to the claim that the contested feature of the external world in fact exists. In each case the existence of the external feature will not be a necessary condition of the aspect of experience or knowledge in question, for a belief about the external feature would always suffice. Although the claim about existence of the aspect of the external world could be secured if certain kinds of verificationism or idealism were presupposed, these views are highly controversial. Besides, one could make as much of an inroad against the skeptic armed with the verificationism or idealism alone, without adducing the transcendental argument at all (cf. Brueckner 1983, 1984).