There are some particulars in the anatomy of the whale, which, I believe, have either entirely escaped observation, or have not been as yet communicated to the public. The parts which in the whale correspond in situation and office with the mesenteric glands of other animals, differ considerably from those glands in structure. These peculiarities are not only curious in themselves, but are illustrative of circumstances, hitherto esteemed obscure, in the anatomy and ceconomy of the lymphatic glands in general. I therefore take the liberty of submitting the following account of them to the inspection of this learned Society. The animal, from which the parts that I am going to describe were taken, was a male, of the genus named by Linnæus balæna.