Final answer:
Rowley may have been inspired to make a diary by reading the diary of someone else, similar to other examples mentioned in the given information.
Step-by-step explanation:
Rowley got the idea to make a diary from reading the diary of another person, but it is not specified in the question whom Rowley got the idea from. However, in the context of the given information, we can see examples of other individuals who were inspired by diaries to write their own narratives. For instance, William Byrd's secret diary provides insights into colonial life, and the narrator in the excerpt mentions Grandison's adventurous story which they compare to a novel by Scott. These examples suggest that Rowley could have been inspired by similar narratives or diaries.