We may put our point in yet another way: it is clear that a quicker growth of constant as compared with variable capital, i.e. the progressive metamorphosis of the organic composition of capital, must take the material form of faster expansion of production in Department I as against production in Department II. Yet Marx's diagram, where strict conformity of the two departments is axiomatic, precludes any such fluctuations in the rate of accumulation in either department. It is quite legitimate to suppose that under the technical conditions of progressive accumulation, society would invest ever increasing portions of the surplus value earmarked for accumulation in Department I rather than in Department II. Both departments being only branches of the same social production--supplementary enterprises, if you like, of the 'aggregate capitalist',--such a progressive transfer, for technical reasons, from one department to the other of a part of the accumulated surplus value would be wholly feasible, especially as it corresponds to the actual practice of capital. Yet this assumption is possible only so long as we envisage the surplus value earmarked for capitalisation purely in terms of value. The diagram, however, implies that this part of the surplus value appears in a definite material form which prescribes its capitalisation. Thus the surplus value of Department II exists as means of subsistence, and since it is as such to be only realised by Department I, this intended transfer of part of the capitalised surplus value from Department II to Department I is ruled out, first because the material form of this surplus value is obviously useless to Department I, and secondly because of the relations of exchange between the two departments which would in turn necessitate an equivalent transfer of the products of Department I into Department II. It is therefore downright impossible to achieve a faster expansion of Department I as against Department II within the limits of Marx's diagram. However we may regard the technological alterations of the mode of production in the course of accumulation, they cannot be accomplished without upsetting the fundamental relations of Marx's diagram.