Is this the paragraph you're referring to?
In a treatise, therefore, on female rights and manners, the works which have been particularly written for their improvement must not be overlooked; especially when it is asserted, in direct terms, that the minds of women are enfeebled by false refinement; that the books of instruction, written by men of genius, have had the same tendency as more frivolous productions; and that, in the true style of Mahometanism, they are treated as a kind of subordinate beings, and not as a part of the human species, when improvable reason is allowed to be the dignified distinction which raises men above the brute creation, and puts a natural scepter in a feeble hand.