Pulmonary consumption, pneumonia, and allied diseases of the lungs : their etiology, pathology and treatment, with a chapter on physical diagnosis . had been intro-duced experimentally with a hypodermic syringe. Why doesthe infection fail to spread and cause pulmonary tuberculosisas in the case of animals ? Is it because the soil is non-recep-tive? This might be true in healthy persons, but can hardlybe said of cases of Potts disease, and of tuberculosis of theperitoneum. Is it because there is a difference in the vitalresistance to the bacilli between man and animals? Or is itprincipally beca
Pulmonary consumption, pneumonia, and allied diseases of the lungs : their etiology, pathology and treatment, with a chapter on physical diagnosis . had been intro-duced experimentally with a hypodermic syringe. Why doesthe infection fail to spread and cause pulmonary tuberculosisas in the case of animals ? Is it because the soil is non-recep-tive? This might be true in healthy persons, but can hardlybe said of cases of Potts disease, and of tuberculosis of theperitoneum. Is it because there is a difference in the vitalresistance to the bacilli between man and animals? Or is itprincipally because the efficiency of the tubercle bacillus as acause of pulmonary consumption in the human subject isoverestimated? All the data that can be gathered on thissubject seem to favor the correctness of the latter conclusion. CHAPTER Xn. pathology of pulmonary Structure of the Respiratory Organs, The lungs are enclosed within the thoracic cavity, and aredivided into five lobes—of which there are three in the rightand two in the left lung. The arrangement and topographyof these organs are fully described in the following figures:. Fig. 9.—Diagram showing the relation of the lobes of the lungs tothe front wall of the chest.—Fowler. It may be said that each lobe has a cone-like shape, withits apex directed either forward or backward. Thus theupper lobe of the left and the upper and middle lobes of theright lung have their apices behind and above, and theirbases in front; while the lower lobes of both lungs have theirapices in front and below, and their broad bases behind. 248 DISEASES OF THE LUNGS. This is partly illustrated in the diagrams of figures 9 and10, which show a side view of both lungs. The septum,which separates the upper and lower lobes of the left lung,begins near the top behind and extends diagonally down-wards and forwards and ends in front near the base of thechest. The septa which divide the right lung into three lobesalso begin at the top behin
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