It did take me to the page (Kindle Fire browser). Preceded by more info. this part might be relevant to your question.

The bromo-iodide of copper intensifier is better in everyway than the uranium, although perhaps a little more expensive and troublesome to make up. But it may be used for bromide papers and lantern slides as well as for negatives. With all it has a toning action just as uranium, and is far more reliable.
Never heard of uranium toner, think I'll pass on that one.