In Chapter 1, who is the ''Jew'' that Phillip Lombard refers to?

Phillip Lombard is referring to Mr. Isaac Morris.

He had said it in a casual way as though a hundred guineas was nothing to him. A hundred guineas when he was literally down to his last square meal! He had fancied, though, that the little Jew had not been deceived - that was the damnable part about Jews, you couldn't deceive them about money - they knew!

He had said in the same casual tone:

"And you can't give me any further information?"

Mr. Isaac Morris had shaken his little bald head very positively.