I forbear from quoting from judgments in other cases, not because quotation would be irrelevant, but because it must necessarily be indecisive when the question is to be seen "as a matter of practical reality depending on the facts of each particular case" [1] . Not only is the question one of fact and degree, and not only do the facts of cases vary, but the measure is itself uncertain. The economic ideas embodied in such phrases as "the practical realities of trade", "the practical conception of trade, commerce, or intercourse" are not susceptible of precise analysis or more exact statement. Business methods and the pattern of trade change as new means of communication and of carriage are developed. Aided by s. 92, commerce itself has for its purposes obliterated the boundaries of States from the map of Australia except for those who would use s. 92 spuriously by "border hopping". It seems to me therefore that only in the simplest case can a court, required to bear in mind the practical realities of commerce, say dogmatically that a particular view of the facts of a case in this field is obviously right or wrong. Judgment is unavoidably much a matter of opinion, because based on concepts that are imprecise and not the ordinary concepts of law. Of course, in some cases the transport of goods can readily be said to be essentially of an intra-State character although the goods being transported may have earlier come from or will later go to another State. An example is movement within a State in the performance of a contract of sale between persons in that State. It is then immaterial that the goods may be destined by the buyer to go ultimately to another State, or may have earlier been brought from another State by the seller. But in the present case the movement of the timber from Deloraine to Melbourne was throughout the result of the course of dealing between Haines and the Kauri Company. That fact gave unity to the movement. The argument that there was at Devonport a significant discontinuity in that movement is based partly upon the interval of time, up to two years, in which the timber was there stacked for drying before being sent forward to Melbourne as it was called for. To me, however, this interval does not mean that before it reached Devonport the timber was not, as a matter of the practical realities of trade, on its way to Melbourne pursuant to the arrangement by which Haines in Tasmania supplied its customer, the Kauri Company, in Victoria with timber. But it was urged that not only the lengthy delay but what occurred at Devonport broke the movement in two - a movement from the mill to Devonport, later a movement from Devonport to Melbourne. The matters that, as I understood the argument, were principally relied upon in support of this were: that the timber had to be dried in racks in Haines' yard at Devonport before it was sent to Melbourne; that when put in the racks it became the property of the Kauri Company, Haines holding it thereafter as a bailee with a duty to forward it by ship in lots as called for; that a small part of the timber that left the mill was discarded at Devonport as defective and never became the property of the Kauri Company. The consequence of these matters combined must, it was urged, be considered. I agree that that is so. But that a small quantity of the timber that left Deloraine might never reach Melbourne can I think be disregarded. The question whether the timber that was being carried on the way to Devonport could be said to be on its way to Melbourne is not answered by saying that some of it might fall by the wayside for one reason or another. The character of a march is not altered because some of the marchers may fall out before the destination is reached. The question is not whether each stick of timber on the lorry would reach Melbourne. Nor do I think that it is of much significance that the lots which went to Melbourne by ship did not correspond to the loads that went to Devonport by vehicle. It would, I think, be a mistake to take as a criterion some idea savouring of the "original package" doctrine that at one time dominated the interpretation of the commerce clause in the Constitution of the United States. It was said, however, that the fact that the timber had to be dried before it was shipped was a critical circumstance; that what Haines was to supply was dried timber not green timber; that the movement to the yard at Devonport was thus antecedent to the commencement of the inter-State movement of the thing to be supplied. The decision in Grannall v. Marrickville Margarine Pty. Ltd. [1] was referred to. The Court there said: "It is of course obvious that without goods there can be no inter-State or any other trade in goods. In that sense manufacture or production within, or importation into, the Commonwealth is an essential preliminary condition to trade and commerce between the States in merchandise. But that does not make manufacture production or importation trade and commerce among the States. It is no reason for extending the freedom which s. 92 confers upon trade and commerce among the States to something which precedes it and is outside the freedom conferred" [2] . There is a passage in the judgment in O'Sullivan v. Noarlunga Meat Ltd. [No. 2] [3] that points to a similar limitation upon the power of the Parliament to make laws under s. 51 (i.) with respect to trade and commerce. But this ought not to be understood in the same absolute sense: and it is not so stated. The two provisions of the Constitution are not to be measured one against the other. That was emphatically asserted in the judgment in the Margarine Case [1] . But one argument for the appellant seemed to me to overlook this. We were invited to interpret s. 92 by a forecast of what would be the effect of doing so upon the interpretation of s. 51 (i.). We were asked to take counsel of fears. But there need be no fears. The constitutional power of the Commonwealth Parliament under s. 51 is not to be narrowly confined. If it be necessary to decide whether under it activities occurring within a State could in a given case be controlled and regulated by the Parliament, the question involves considering whether, in the circumstances of the assumed case, a law with respect to inter-State trade would, to be effective, have to extend to intra-State activities also. The recent decision in the Airlines Case [2] is an example of this approach and the matter is adverted to incidentally in the judgment in the Margarine Case [3] where there is a reference to the Mandeville Island Farms Case [4] , in the United States, one of many cases in which the power of Congress over commerce has been extended and expanded by the aid of what has come to be called the Shreveport doctrine: see Houston, East and West Texas Railway Co. v. United States [5]