A man of Dr. Caius’s incessant activity and zeal for his own opinions could not hope to remain without enemies. In 1565 three fellows of his college, whom he had expelled, charged him with atheism and opposition to professors of the Gospel. His maintenance of his post at court under sovereigns of opposite religious professions, notwithstanding his attachment to Romanism, was made a subject of accusation of unsteadiness in his religious principles. Fuller remarks that “his being a reputed papist was no great crime to such who consider the time when he was born, and foreign places wherein he was bred. However, this I dare say in his just defence: he never mentioneth Protestants but with due respect, and sometimes doth occasionally condemn the superstitious credulity of popish miracles.” Nevertheless, he retained in his college certain books and vestments formerly used in the Roman Catholic service, and Bishop Sandys having written to the vice-chancellor, Dr. Byng, complaining of this, they were collected and burnt in 1572 (Dec. 13), much to Dr. Caius’s vexation, who considered Dr. Byng’s action most arbitrary, and inveighed strongly against the conduct of certain fellows of his college in the matter. Previous to this time, in 1570, Dr. Caius had published an account of British dogs, which is the earliest scientific description of the kind of dogs then occurring in this country. It had been the result of a request by the celebrated naturalist, Gesner, whose death in 1565 prevented its earlier publication. Numerous other accounts of British natural history had been furnished by Dr. Caius to Gesner, and were inserted in his works. To give an idea of our doctor’s ability in descriptive natural history, we subjoin his account “Of the dog called a Bloodhound.”