On the injectivity of the map of the Witt group of a scheme into the Witt group of its function field

In the published version of the article a whole portion of the text is missing starting on p. 465, line 6. This portion of the text includes the statement of a Proposition, together with the beginning of its proof; it is the rest of this proof which occupied the last pages (465 through 468) of the article. What follows is the missing text of the paper, from the beginning of Remark 18 to the line preceding Diagram (7) on p. 465. There are no changes from that point on.