TeX capacity exceeded, sorry [PDF memory size

[Alan Bowen <acbowen@princeton.edu>]

I had been processing a rather complicated set of pages successfully  
until late this morning. Now I get this (edited) error message:

________________________

This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4)  
(format=cont-en 2005.6.10)  13 JUN 2005 13:34
entering extended mode
(/usr/local/teTeX/share/texmf.local/web2c/natural.tcx)
**&cont-en Geminus_Intro_c8.tex
(./Geminus_Intro_c8.tex

ConTeXt  ver: 2005.06.08  fmt: 2005.6.10  int: english  mes: english


! TeX capacity exceeded, sorry [PDF memory size (pdf_mem_size)=65536].

If you really absolutely need more capacity,
you can ask a wizard to enlarge me.

Here is how much of TeX's memory you used:
3111 strings out of 62015
51823 string characters out of 633399
4546524 words of memory out of 6074780
38469 multiletter control sequences out of 10000+50000
508064 words of font info for 219 fonts, out of 2000000 for 2000
172 hyphenation exceptions out of 1000
78i,22n,104p,4501b,1458s stack positions out of 5000i,500n,6000p, 
200000b,40000s
PDF statistics:
35 PDF objects out of 300000
3 named destinations out of 131072
65281 words of extra memory for PDF output out of 65536
!  ==> Fatal error occurred, the output PDF file is not finished!
________________________

So, how may I increase pdf_mem_size and by how much should I do this?

Thanks for any help!

Alan Bowen