I don't know this play at all, so I had a quick look and found the bit where he is raging about 'horns' in the forest.Yes I know about the mother taking the Arden name to seem like nobility but don't forget about Shakespeare marrying the pregnant Anne, even though another woman had turned up to say that they were married the week before in a church.Do you know about the Herne the Hunter event ? The antler headed god ? Every year ,I think probably Midsummer's Eve, I can't remember exactly, the unmarried maidens would go into the nearby woods and spend the night to be chosen by Herne aka Robin, the Hooded Man. Any baby resulting from this would be known as Robins Son, hence the surname Robinson. I would think there were plenty of 'horns' around that night..:) Merrie England..also the horns on the foreheads suggest the horns of the cuckold .
A Touchstone was used by Alchemists. Is there any text in particular to look at ?