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I'm having trouble / confused with the following passage from OPAR: "A definition in terms of fundamentals can be formulated only by reference to one's full knowledge of the units. In order to identify a fundamental distinguishing characteristic (and a fundamental integrating characteristic—the genus), one must take into account all the known facts in the case. One must bear in mind how the units differ from other things, how they resemble other things, and what causal relationships obtain within these two sets of attributes. Only on this basis can one establish that a certain characteristic is fundamental (within that context of knowledge)." the attributes are differences and resemblances? I don't think a difference is an attribute. It's a property or some kinda relationship between attributes. what is meant by "what casual relationships obtain within these two sets of attributes". What kind of casual relationships? How can you go within attributes? On this basis - What basis? is it the basis of genus? or the previously mentioned attibutes / what casual relationships obtain. I've been working through this book for months and I'm still not even half way