EXHIBIT 23.05

                    [BLAKE, CASSELS & GRAYDON LLP LETTERHEAD]

                                 April 26, 2002

PRI Automation, Inc.
805 Middlesex Turnpike
Billerica, Massachusetts 01821 U.S.A.

Ladies and Gentlemen:

         Reference is made to the information set forth under the heading
"Canadian Federal Income Tax Considerations" (the "Canadian Federal Income Tax
Summary") contained in the Registration Statement on Form S-3 (the "Registration
Statement"), filed by Brooks Automation, Inc. (the "Company"), with the
Securities and Exchange Commission (the "SEC") on the date hereof, for the
purpose of registering shares of common stock, par value $.01 per share, of the
Company.

         We have aided in the preparation of certain portions of the
Registration Statement, including in particular the Canadian Federal Income Tax
Summary. We hereby confirm that, as of the date hereof, and relying in part in a
certificate of an officer of the Company as to certain factual matters, the
Canadian Federal Income Tax Summary is an accurate summary of the matters
addressed therein, subject to the limitations and qualifications set out
therein.

         This opinion is furnished to you solely for your benefit in connection
with the filing of the Registration Statement and is not to be used, circulated,
quoted or otherwise referred to for any other purpose or relied upon by any
other person for any purpose without our prior written consent. We consent to
the use of our name in the Canadian Federal Income Tax Summary and under the
heading "Legal Matters" and to the filing of this opinion with the SEC as an
exhibit to the Registration Statement. In giving such consent, we do not thereby
admit that we are in the category of persons whose consent is required under
Section 7 of the Securities Act of 1933, as amended, or the rules and
regulations of the SEC promulgated thereunder.

                                      Yours very truly,

                                      /s/ Blake, Cassels & Graydon LLP

                                      Blake, Cassels & Graydon LLP