In a Library
Book as person
Dickinson personifies the book as male throughout—'his century,' 'his hand.' Books were masculine in Latin (liber), and 19th-century scholars were overwhelmingly male.
Plato as certainty
When Plato was still alive to answer questions directly, not filtered through centuries of interpretation. 'Certainty' means firsthand knowledge, not philosophical doctrine.
Dante's Beatrice
Beatrice Portinari died at 24 in 1290. Dante immortalized her in *La Vita Nuova* and *Divine Comedy*—the 'gown' he 'deified' is both her actual dress and his literary treatment of her.
Dreams were sown
The book's author lived in the actual past that readers can only dream about. 'Sown' suggests those historical moments planted the seeds of present culture.
Vellum heads
Vellum is calfskin parchment used before paper. Old books literally shake their pages (heads) when you turn them—the personification extends to all volumes on the shelf.