The single word that comes to mind is "turgid." Pretty much a slog to get through and tiny type, so I have to read it in small segments. It is disconcerting that he writes about Spinoza in the present tense, as though he's still alive and writing, too.
I'm reading many segments of this book out of ardent curiosity, not because I'm a professional nor even a student. I had to request it via inter-library loan from a university rather far from where I live, so my time to read it is limited, and I'm not likely to read the entire book. But it's well-organized, comprehensive and, so far, it is answering at least most of the questions I have. I'm still wondering about the difference between monism and panpsychism, so I hope I end up knowing whether there is one or what it is if there is a difference.
LATER:
It's a well-organized, comprehensive textbook with chapters by many different philosophers, so I recommend it. I didn't intend to read every chapter, but read selected ones. I learned a bit more, which was the goal. A sampling:
Chapter 9: [Bertrand] Russell’s Neutral Monism and Panpsychism
By Donovan Wishon
“Neutral monism is the view that both mental and material phenomena arise from a single kind of more basic reality (monism) which is neither mental nor material (neutral).” (p 87)
“Absolute idealism is the view that all human knowledge is mediated through conceptual structures which modify and distort the raw materials of experience, thereby obscuring the true fundamentally mind-life nature of reality. Some versions hold that reality consists entirely of a community of immaterial conscious beings, while others hold that all of reality is a single, indivisible conscious whole.” (p 88)
“Following [William] James (1904), he proposes that the transitory qualities we experience are intrinsically neither mental nor material, but rather ‘neutral’ in character. They become mental or material (or both) by being part of causal processes that are either psychological or physical (or both). Thus, Russell argues, ‘the mental and the physical are not distinguished by the stuff of which they are made, but only by their casual laws.’” (p 90)
Chapter 10: Panpsychism Reconsiders: A Historical and Philosophical Overview
By David Skrbina
“Though the concept is ancient, the term ‘panpsychism’ comes to us from the work of the Italian philosopher Francesco Patrizi, and his Nova de universis philosophia of 1591. The word derives from pan (‘all’) + psyche (‘mind’ or ‘soul’). Broadly conceived, it is the notion that all things possess some degree of mind, consciousness, or subjectivity. In principle, this reaches down to the smallest physical ultimates and upward to the cosmos as a whole. It admits of a surprisingly wide variety of interpretations.” (p 103)
Chapter 22: Panpsychism Versus Pantheism, Polytheism, and Cosmopsychism
By Yujin Nagasawa
“The term ‘panpsychism’ originates from ‘panpsychia,’ which the 16th century Italian philosopher Francesco Patrizi applied to his view that God’s phenomenality is a present throughout the cosmos. Hence, the first view that was labeled ‘panpsychism’ seems to be a version of pantheism. This is understandable given how similar panpsychism and pantheism initially appear. In Greek, ‘pan’ means ‘all,’ ‘psyche’ means ‘soul’ or ‘mind,’ and ‘theos’ means ‘God.’ Hence, panpsychism is the view that all is mind while pantheism is the view that all is God.” (p 260)