The central principle is that the kind of definition depends on the logical status of its constituent terms.
Complete hadd: proximate genus + proximate differentia.
Incomplete hadd: remote genus + proximate differentia, or differentia alone.
Complete rasm: proximate genus + property.
Incomplete rasm: remote genus + property, or property alone.
A common accident does not provide the required distinction. Real definition explains the thing, while verbal definition clarifies the expression.
The textbook next opens its second major chapter on propositions, including categorical and conditional forms. The focus shifts from explaining concepts to the structure of judgment.