Oxalate LithiasisUrinary lithiasis is a broad subject. There are a number of excellent general papers that are of considerable value for the purpose of orientation in this complex field.8283848586878889 There has been an increasing interest in recent years in the pathogenesis of urinary calculi. Many factors, such as hyperparathyroidism, persistent hypercalcinuria, urinary-tract stasis, a persistently alkaline urine, infection of the urinary tract with urea-splitting organisms and prolonged recumbency, have been established as causes of phosphate calculi. Furthermore, the prevention of their recurrence and even their dissolution by chemical means have had some measure of success. By contrast, the pathogenesis . . .