Answer:
Similies and metaphores as well as repetition
Step-by-step explanation:
There are quite a few similies present including: "White as the gleam of a receding sail" "White as a cloud that floats and fades in air" and "White as the whitest lily on a stream". There are many more similies in addition to those. There are a few metaphores-- "These tender memories are;—a fairy tale Of some enchanted land we know not where" and "When the full river of feeling overflows". There is some repetition of the phrase "white as".