The Virgin of the Lilies: Symbol Question

In William Bouguereau painting entitled, The Virgin of the Lilies it has Mary’s middle and ring finger together on both hands. It seems to me that this was done to symbolize something, but what?

cureofars.blogspot.com/2005/07/apologetics-through-art-virgin-of.html

Here is the painting…

maria21.net/images/pic/Bouguereau/La_Vierge_au_lys.jpg

I don’t have your answer, but noticed that Jesus’ left hand is in the same gesture.

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