So a comrade over on Marxmail dug up the official version, which is as follows:
However the course of this crisis may develop itself--although most important to observe in its details for the student of capitalistic production and the professional theoricien--it will pass over, like its predecessors, and initiate a new 'industrial cycle' with all its diversified phases of prosperity, etc.
Marx and Engels Collected Works, Vol: 45, Progress Publishers, Moscow (1991), p. 355