The passage discusses the economic importance of certain organisms, particularly as a food source for small fish and as a potential destructive agent, causing "red water" outbreaks that can affect the health and life of slow-moving or bottom-living animals. It also highlights some inaccuracies in a memoir by Prof. Kofoid, including mislabeling in phylogenetic diagrams and misprints in figures. The memoir is praised for its comprehensive coverage of species descriptions and their history, making it an indispensable resource for researchers in this field. The second part reviews J. M. Keynes's book on probability theory, which challenges traditional views by not defining probability numerically and denying that all probabilities can be expressed by numbers. Keynes criticizes the principle of non-sufficient reason and the view that mutually exclusive alternatives have equal probabilities. The review notes that Keynes's approach is cautious but valuable, and the book is recommended for students aiming to understand scientific principles deeply. The final section provides a positive assessment of the Royal Society's "Catalogue of Scientific Papers, Fourth Series (1884-1900)," praising its high standards, typographical excellence, and comprehensive coverage of scientific publications during the specified period.The passage discusses the economic importance of certain organisms, particularly as a food source for small fish and as a potential destructive agent, causing "red water" outbreaks that can affect the health and life of slow-moving or bottom-living animals. It also highlights some inaccuracies in a memoir by Prof. Kofoid, including mislabeling in phylogenetic diagrams and misprints in figures. The memoir is praised for its comprehensive coverage of species descriptions and their history, making it an indispensable resource for researchers in this field. The second part reviews J. M. Keynes's book on probability theory, which challenges traditional views by not defining probability numerically and denying that all probabilities can be expressed by numbers. Keynes criticizes the principle of non-sufficient reason and the view that mutually exclusive alternatives have equal probabilities. The review notes that Keynes's approach is cautious but valuable, and the book is recommended for students aiming to understand scientific principles deeply. The final section provides a positive assessment of the Royal Society's "Catalogue of Scientific Papers, Fourth Series (1884-1900)," praising its high standards, typographical excellence, and comprehensive coverage of scientific publications during the specified period.