You know what, forget it. I am not raising the cat population in Philadelphia. I give up. The kittens have gone on vacation again, perhaps to the Jersey shore for a brief respite from the free food and water and shelter provided by yours truly. I suppose the mom will return with them in another two days, and I will be relieved and then worried that they'll go away and on and on until the cats are old enough to reproduce and give and take away their offspring with the same illogical frequency.