I am not completely sure, but I would say that the apothecary suggests that Jane go to school because he believes Jane would be happier and healthier away from Gateshead. She tells him how unhappy she is, so that is why he wants to help her.
The boy influences the crystal merchant by following his or her dreams the boy is even teaching him andalusia and sheperding, notice how he also tells the merchant take a chance and seize the opportunity.
