Chemistry--Experiments--19th century 1 Chemistry--Study and teaching--19th century 1 Chemistry--Study and teaching--20th century 1 Indians of North America--Languages 1 Indians of North America--Research--19th century 1 Pennsylvania--Description and travel--19th century 1 Religious Thought--19th century 1 more ... Trumbull, Joseph 1 Yale University--New Haven (Ct.)--Geology and Chemistry Department 1 less ...