This volume has been prepared by Dr. Lendon from MS. notes and papers left by Dr. Thomas at his death. It opens with an appreciative biographic sketch of the author, and then discusses hydatid diseases as affecting the abdominal organs in Part I. This Section includes the liver, the spleen, the kidney, the peritoneum, the male pelvis, the female pelvis, and the testicle. Part II gives the hydatid disease of the thoracic viscera, i. e., the lungs and pleura, the heart, the great blood vessels. Part III is devoted to the hydatids of the nervous system, principally a discussion of hydatid disease of the brain and its membranes and the spinal cord. This is stated to be essentially a reprint of Dr. Thomas' paper on this subject in the Transactions of the Inter-Colonial Medical Congress of Australasia. Part IV, hydatid disease affecting the bones, muscles and superficial structures, viz.: The