Final answer:
The phrase in question is indicative of the arrival of fall, as evidenced by the descriptive passages that highlight cooler winds, changing leaf colors, and typical autumnal atmospheric changes.
Step-by-step explanation:
The question 'The night and morning chill signaled the coming of fall' can be inferred as true based on the provided text extracts. These passages use descriptive literary techniques to depict the atmosphere and changes in the environment typically associated with the transition into autumn. Characteristics of fall such as a cool wind, changing leaves, and the chilly evenings are central themes in the extracted texts. For instance, phrases like 'a trembling and turning of the aspen leaves,' 'a fine autumnal day,' and 'the forests had put on their sober brown and yellow' strongly evoke the fall season. In addition, the mention of 'Cold is settling into the room' and the presence of frost suggest the dropping temperatures that often signal autumn's arrival. Finally, descriptions such as 'the chill of the evening was in his limbs' and 'a damp chill that went right through' coincide with the typical sensations of the season's onset. These references to cooler temperatures and environmental changes affirmatively describe the signs of fall depicted in the excerpts.