Snape and Quirrell in ps/ss ??

[laoisecronin at yahoo.com]

No: HPFGUIDX 28190

 Did anyone ever wonder why Snape suspected Quirrell was after the 
stone?(book 1) Quirrell said that Snape already suspected him at 
halloween which is early enough in the year. If Quirrell had been a 
nervous and jittery person all these years what made Snape suspect 
anything was different about him this year?.Also every one seemed to 
think that Quirrell was incapable of doing anything much in the way 
of dark magic(they only read from books in class) so some thing must 
have happened that made Snape think otherwise.But we are never told 
what this was. Did Snape ever even voice his suspicions to 
Dumbledore?. Dumbledore never says anything about Snape suspecting 
Quirrell(well not to Harry anyway). Did Snape somehow know that 
Voldmort was involved( can he "sence" Voldemort through his dark mark 
in the same way that Harry can sence him through his scar) but if he 
thought this he would have had to tell Dumbledore about it. Wouldn't 
he?.Maybe he knew all along but really wanted Quirrell to suceed and 
he had to appear like he was against it in case anything went wrong 
and he got caught.
 Or maybe i've gone rambling off in the totally wrong direction!.Can 
anyone make any sence of what i'm trying to say or is it just 
nitpicking at small insignificant details?????