Can't chmod +g on a directory

[Steve Matzura]

"jim" and "bob" are two directories in /home owned by root and in the 
root group. They both have subdirectories called uploads. 
/home/jim/uploads is owned by jim in the jim group and has protection 
mask 755 (drwx-rx-rx). /home/bob/uploads is owned by bob but in another 
group entirely, and its protection mask is 774 (rwxrwxr--). I want to 
change /home/jim/uploads to the same permissions as /home/bob/uploads, 
but whenever I "sudo chmod +g /home/jim/uploads", nothing happens. Of 
course, I do get the prompt for the admin password, and I provide it, so 
there are no errors generated, but the group flag doesn't change. I also 
tried changing the group ownership of /home/jim/uploads to the same 
group that /home/bob/uploads is in, thinking there's a connection, but 
chmod +g still won't give group write access to /home/jim/uploads. Why?
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