The Capillary Network of Normal and Emphysematous Human Lungs Studied by Injections of Indian Ink

In the past few years there has been renewed interest in the pathology of pulmonary emphysema, and the need has arisen to demonstrate the patterns of pulmonary capillaries more clearly. The present paper describes an injection method developed for such purposes using a mixture of black waterproof ink and gelatin. Some prelimi- nary findings in normal and emphysematous lungs are described.