This is the author's third book on the pneumonias, the previous two published in 1938 and 1954, respectively. Early in the present edition he makes reference to the fact that there has been a general shift in interest away from the bacterial pneumonias since that time; at present there is much greater emphasis on viral, gram-negative, and mycotic pneumonias as well as chronic pulmonary disease caused by newly recognized microbes. There is also interest in pneumonias resulting from inhalation of dusts, exposure to chemicals and drugs, and from allergy. While the present book is constructed so as to include those pneumonias which now command greater interest, the book is of wide scope and includes discussion of a variety of pulmonary disorders. These include varicella pneumonia, giant cell pneumonia, pneumonia in rocky mountain spotted fever, tularemia, endemic typhus and scrub typhus, traumatic pneumonia, and pneumonia in malaria and in kala azar.