Very nice overview of the field as known at the time. Already the bacteria are no longer treated (although he has to mention why), but "although the author is firm in his belief that the Mycetozoa ... are not related to the fungi; are not, indeed, plants, he ... gives them a place in this book in deference to the opinions of the many botanists who view them as fungi." p.2-3
Also, "The author, influenced by the teachings of his father... has always had great interest in phylogenetic speculations, valueless though these are considered to be by some botanists, particularly by those who are firmly wedded to the system of classification to which they have been long accustomed. He believes that these speculations may stimulate studies in the life-history, cytology, morphology, etc. of various groups of fungi, and thus clear the way for laying the foundations of a more logical system of classification." p. vii-viii
This is actually the second edition of his 1935 textbook.