Typed letter dated 6 February, 1902. Bashford Dean writing from Department of Zoology, Columbia University. Regarding undertaking exchanges of material between institutions and thanks for answer to recent letter.

Typed letter dated 23 May, 1902. Bashford Dean writing from Department of Zoology, Columbia University. Regarding the fine collection of separates received through the Smithsonian Institution.

Typed letter dated 5 February, 1903. Bashford Dean writing from Department of Zoology, Columbia University. Regarding E. R. Waites account of Chimaera ogilviei and the possible exchange of specimens.

Typed letter dated 14 November, 1903. Bashford Dean writing from Department of Zoology, Columbia University. Regarding thanks for sending not merely the specimen but excellent photograph's of collection material.

Typed letter dated 26 September, 1904. Bashford Dean writing from Department of Zoology, Columbia University. Regarding his recent absence due to a trip abroad and thanking Waite for his curtesy in the matter of exchanges.