Derek,

>> This ablative in -to doesn't seem to be mentioned in Geiger, at least I

can't find it, but it is mentioned in Warder. I usually turn to Geiger
first, but apparently -- unless I'm missing something -- there are some
points that are in Warder but not in Geiger.<<

This is at Geiger's "A Pali Grammar" pg.69 (#77.2).

Sean