Exhibit 16.1
April 22, 2005
Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549
Commissioners:
We have read the statements made by Hercules Incorporated (copy attached), which we understand will be filed with the Commission, pursuant to Item 4.01 of Form 8-K, as part of the Company’s Form 8-K report dated April 18, 2005. We agree with the statements concerning our Firm in such Form 8-K.
Very truly yours,
PricewaterhouseCoopers LLP