It is held in an overhanded mannor very similar to that of the cello. The bow should be held with the left hand while the student is formulating the bow hold.
Middle finger goes over the stick parallel to the position of the thumb.
The ring and pinkie fingers fall over the stick and come into contact with frog. The index finger falls naturally over the stick. All the knuckles are bent. The same as the above only place the thumb under the frog. Must watch for a relaxed hand.