sentences:  Maeda and other students escorted Rossier around Nagasaki, while the latter took photographs of priests, beggars, the audience of a sumo match, the foreign settlement, and the group portrait of Alexander von Siebold and samurai.Rossier believed that Pompe van Meerdervoort's failures in photography were due to a lack of the necessary chemicals and so he provided Maeda with a letter of recommendation to procure photographic apparatus and chemicals from a source in Shanghai.Both Maeda and Furukawa bought lenses, chemicals and albumen paper through Rossier.