Hooke wanted Daniel to bring various parts and tools and materials used in the making of watches and other fine mechanisms; some of the stones that had been found in the Earl's heart; a cylinder of quicksilver; a hygroscope made from the beard of a wild oat; a burning-glass in a wooden frame; a pair of deep convex spectacles for seeing underwater; his dew-collecting glass, * and selections from his large collection of preserved bladders: carp, pig, cow, and so on. He also wanted enormous, completely impractical numbers of different-sized spheres of different materials such as lead, amber, wood, silver, and so forth, which were useful in all manner of rolling and dropping experiments. Also, various spare parts for his air-compressing engine, and his Artificial Eye. Finally, Hooke asked him to collect 'any puppies, kittens, chicks, or mice you might come across, as the supply hereabouts is considerably diminished.'