I have recently brought a new female cat into my household. She is 4 years old and very very sweet.The problem arises with the fact that I have a 10 year old male who has reigned over this household. Both cats are fixed but the female is not declawed. She was an indoor before and she will remain so in my house.

Oscar - my 10 year old male - is not making life easy on the new cat. I am attempting to bring them together gradually - leaving the door cracked in the room where she is currently residing, sharing scents between the two, etc etc.  When he sees her, he does the normal ranting and raving. She scatters when she sees him - hiding under the bed.

I've been keeping any eye on both of them when I am home and keep her sequestered in one of my bedrooms when I am away. She stays in the bedroom most of the time unless I put Oscar in another bedroom so she can get used to the house.

He seems particularly aggressive towards her and has made several attempts to chase her.
What more can I do to assist in warming this relationship? Its been about a week since she has been in the house.

thanks