What predictions did he make that were proven? I know quite a few statements that he made which have been proven wrong by real science:
1. that the brachyo-cephalic index means anything.
2. that fossils would prove evolution - after 150 years and 100 times more fossils than we had then it still does not.
3. that the genes of the parents "meld" in the progeny - refuted by Mendellian genetics.
You're talking "he" rather than the theory, which is rather limiting, and many scientists throughout evolution theory and many other theories have made hypotheses that turned out not to be true -- this is the nature of science. These hypotheses are then not taken as part of the theory. However, PatrickHenry already gave you the link to many predictions come true.