Teri I am so glad you took this little one in.
Now I think it is important to get him to the vet. At the moment I'd keep him separated from George- not only because of territorial reasons but also because you do not know whether he is healthy- on top of his accident he could have worms etc.

Then a very slow introduction is recommended- they should be able to sniff under the door. You can take a towel on which one has slept to rub the other- there are many Pet Talkers who can give you advice.

But first I send good thoughts for the little one being healthy.