Why is the stranger anxious for his baggage?

The stranger was anxious to unpack his chemistry supplies.

"...... the stranger flung himself upon it with extraordinary eagerness, and began to unpack it, scattering the straw with an utter disregard of Mrs. Hall's carpet. And from it he began to produce bottles—little fat bottles containing powders, small and slender bottles containing coloured and white fluids, fluted blue bottles labeled Poison, bottles with round bodies and slender necks, large green-glass bottles, large white-glass bottles, bottles with glass stoppers and frosted labels, bottles with fine corks, bottles with bungs, bottles with wooden caps, wine bottles, salad-oil bottles—putting them in rows on the chiffonnier, on the mantel, on the table under the window, round the floor, on the bookshelf—everywhere. The chemist's shop in Bramblehurst could not boast half so many. Quite a sight it was. Crate after crate yielded bottles, until all six were empty and the table high with straw; the only things that came out of these crates besides the bottles were a number of test-tubes and a carefully packed balance.