The lymphatic bed of the main human bronchi has been studied in normal conditions and at venous stagnation. Different methods both with injections and without injections have been applied. Definite regularities in changes occurring in the lymphatic bed of the main human bronchi at venous congestion have been stated. The changes occurring in the lymphatic bed of the mucous membrane of the main human bronchi seem to be a response to those metabolic processes which develop at decompensative heart diseases.