The book is divided in three parts.
Crespuculario (1920-1923), El hondero entusiasta (1923-1924) and Tentativa del hombre infinito (1925).
Crespuculario is ,in my opinion, a poetry made of innocence when he describes his feelings in such a way that you even smile, how can be a love be this pure? When Neruda wrote this verses he was between 16 -19 years old. My favorites in this part are Tengo miedo and Canción de los amantes muertos.
El hondero entusiasta has the most passion, he begs for anything his lover can provide him, it's just too beautiful, he expresses himself like he is sick in despair for love.
Tentativa del hombre infinito is more calm.