PROTISTS AND DISEASE

while every portal of entry capable of introducing the bacilli into the lymphatic or blood circulation permits of -the invasion of the lungs, in all susceptible animals ineluding man tuberculosis in all its manifestations results in the immense majority of instances from a primary lymphatic infection which has its origin in the absorption of tubercle bacilli by the alimentary tract through the buccal, pharyngeal or intestinal mucosa. The author is strongly of opinion that, except in rare instances of massive infection, primary infection of the lungs does not occur.