1. Scattered cysts in kidneys otherwise apparently healthy, often these cysts are small, occasionally of large size. • 2. Scattered cysts in Cirrhotic Bright's disease. • 3. Congenital cystic degeneration of the kidneys. • 4. General cystic degeneration of the kidney in the adult - the large Polycystic Kidney. • 5. Hydated cysts.

In the following paper although the first four of these varieties will be described, it is intended to enter into a careful discussion of the fourth variety only, viz, the large Polycystic Kidney of the adult, and to consider the three previous varieties mainly in relation to the fourth.

In addition to that cystic condition of the kidney and its pelvis, and sometimes also of the ureter,which we know as Hydronephrosis, cysts occur in relation to the kidney of at least five different varieties.

In studying the literature of the subject there have been found many cases, both of Hydronephrosis and of single cysts, which are described as cystic kidney.

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