An interesting experience in the study of the etiology and epidemiology of renal stones as related to the ecological factors of patients suffering therefrom. The author, working for over 20 years under the handicap of little assistance, has nonetheless made and reported some interesting observations on such things as the relationship of atmospheric humidity and alkalinity and moisture of the soil to stone formation in his patients in India. He also has attempted to analyze the chemical content of foods the patients eat in the area of Hyderabad, particularly the calcium to magnesium ratio. In delineating the geographical distribution of renal stones in many parts of the world, he points out the difficulties in obtaining accurate information. However, the primary value of this book is its attempt to relate the incidence of stone disease to various environmental factors.