[FOM] Sacks query

[Thomas Forster]

Can anyone tell me (the first para at least) of a talk Sacks once
gave (At an AMS meeting i think) which began something like

``Good afternoon, Ladies and Gentlemen.  Mathematical Logic
splits fourfold into (i) recursion theory, the heart of the subject,
(ii) [or was it (iii)?]  Sets and Classes, whose romantic appeal far
outweighs their mathematical substance......


I have the WSP collected Sacks, but it's not in it.  (I *know* i had 
a copy of it once...)

           Thomas Forster