The history of the Brown Animal Sanatory Institution was intended originally to be published in book form, and was therefore divided into chapters. For the sake of convenience this division has been continued, even though it is unusual for the term to be employed in scientific periodicals. The history will be published serially in four consecutive issues of the Journal of Hygiene. References have presented a difficulty. In two instances the title of the paper referred to has had to be omitted, because no copy of the original journal in which the article appeared has been obtainable. More important, however, is the failure to give references, beyond the date, to a number of statements in the text, because the information in question has been abstracted from sources that are not available to the general reader.