for what two practical necessities did the new colony set aside land in chapter two?

Just to add a bit, Hawthorne is commenting on the impossibility of having a Utopian community(in chapter one) which was a popular idea with some of his contemporaries (such as Emerson).  Hawthorne attempted to live in a Utopian community and it failed miserably, costing him a lot of money.  In chapter one, he points out that a Utopia is impossible, because you can't stop people from dying (hence the need for a cemetery), and you can't stop people from commiting crimes (hence the need for a prison).