in situ, which may be italicized to indicate it's Latin (i.e., not English),
meaning in place.  No capital I unless the first word in a sentence and not
hyphenated.

Several alternative pronunciations are possible
(http://www.yourdictionary.com/ahd/i/i0164000.html):

in si·tu
adv. & adj. 
In the original position. 

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[Latin in sit : in, in + sit, ablative of situs, place.] 


Gary Gill

-----Original Message-----
From: Richard Cartun [mailto:Rcartun@harthosp.org]
Sent: Friday, March 28, 2003 9:08 AM
To: Histonet@pathology.swmed.edu
Subject: In situ vs. in-situ?


I know this is trivial, but what is the proper way to write these two
words?

R. Cartun