There are two reasons that the author uses to illustrate that the town would be negatively affective if the factory was to close and they are:
Source of income.
Gratitude.
Explanation:
First of all the author starts by saying that he is very thankful for being present in one of the factories that were important because of its production. Then he describes that he would give up his beliefs on tariffs if he saw the effect of the factory on people. Then he interviews different persons and the effect of the factory in their lives. Then they tell him that it is better to have a functional factory than one stopped. That they would gather in the hill it was built in case it burned to ashes, and that they would talk all day about the goods it gave them and how their lives improved after it was placed over there.
If the factories are closed without giving appropriate subsidy the the town, it will lead to creation of a negatively influenced town with lack of adequate facilities for the economic and social stability of the town.
Explanation:
The overall effect of the factory closure on the town will be magnanimous as the town will lack the employment opportunities.
Chemistry, because constructing early forms of glass and mortar for setting bricks would require some sort of understanding. The other choices also aren’t very related, you don’t need astronomy for making glass or anatomy for making mortar.
