Which words tell a material needed? plain taffy 1 teaspoon cream of tartar continue heating to a slow boil. boil to 310 degrees.

1 teaspoon cream of tartar

This procedural text is making plain taffy, so this is not a material that is needed. It will hopefully be the result of the procedure. The other options (continue heating to a slow boil and boil to 310) are steps in the procedure. They are things you must do, not materials you can have. The ingredient to make the taffy, 1 teaspoon cream of tartar, is a needed material.

in our power to make a world happy - to teach mankind the art of being so - to a character hitherto unknown - and to have, as it were, a new creation intrusted to our hands, are honors that command reflection, and can neither be too highly estimated,