[1] Quoted from a letter from his brother, Professor W. G. MacCallum, of Johns Hopkins University, to whom I am under obligation for the data given in this sketch. PUBLICATIONS BY JOHN BRUCE MACCALLUM. 1. Fresh-water Cladocera. University of Toronto Quarterly, May, 1895. 2. On the Histology and Histogenesis of the Heart Muscle Cell. Anatomischer Anzeiger, Bd. XIII, 1897. 3. On the Pathology of Fragmentatio Myocardii and Myocarditis Fibrosa. Johns Hopkins Hospital Bulletin, No. 89, 1898. 4. On the Histogenesis of the Striated Muscle Fibre and the Growth of the Human Sartorius Muscle. Johns Hopkins Hospital Bulletin, Nos. 90-91, 1898. 5. A Contribution to the Knowledge of the Pathology of Fragmentation and Segmentation and Fibrosis of the Myocardium. Journal of Experimental Medicine, Vol. IV, 1899. 6. Development of the Pig’s Intestine. Johns Hopkins Hospital Bulletin, Vol. XII, 1901. 7. Notes on the Wolffian Body of Higher Mammals. American Journal of Anatomy, Vol. I, 1902. 8. On the Muscular Architecture and Growth of the Ventricle of the Heart. Johns Hopkins Hospital Reports, Vol. IX, 1900. (Memorial volume to Dr. W. H. Welch by his pupils.) 9. Text-book of Histology and Microscopic Anatomy. By L. Szymonowicz. Translated and edited by J. B. MacCallum. Lea Bros., 1902. 10. On the Mechanism of the Action of Saline Purgatives, and the Counteraction of their Effect by Calcium. (A preliminary communication.) University of California Publications, Physiology, Vol. I, 1903. 11. On the Action of Saline Purgatives in Rabbits and the Counteraction of their Effect by Calcium. (Second communication.) American Journal of Physiology, Vol. X, 1903. Also: University of California Publications, Vol. I, 1904. 12. On the Local Application of Solutions of Saline Purgatives to the Peritoneal Surfaces of the Intestine. American Journal of Physiology, Vol. X, 1904. Also: University of California Publications, Vol.I, 1904. 13. On the Influence of Calcium and Barium on the Flow of Urine. (A preliminary communication.) _Ibid._, 1904. 14. The Influence of Saline Purgatives on Loops of Intestine Removed from the Body. _Ibid._ 15. The Secretion of Sugar into the Intestine Caused by Intravenous Saline Infusions. _Ibid._ 16. The Action of Cascara Sagrada. (A preliminary communication.) _Ibid._ 17. The Influence of Calcium and Barium on the Secretory Activity of the Kidney. (Second communication.) University of California Publications, Physiology, Vol. II, 1904. Also in the Journal of Experimental Zoology, Vol. I, 1904. 18. Ueber die Wirkung der Abführmittel und die Hemmung ihrer Wirkung durch Calciumsalze. Pflüger’s Archiv, Bd. 104, 1904. 19. The Action on the Intestine of Solutions Containing two Salts. University of California Publications, Vol. II, 1905. 20. The Action of Purgatives in a Crustacean (_Sida Crystallina_). _Ibid._, 1905.