The book consists of three parts, an introduction, a grammar section, and a dictionary. Zamenhof begins by renouncing all rights to the language, putting it in the
public domain. In the introduction, Zamenhof lays out his case for the need for an
international auxiliary language (IAL). He states that previous attempts, such as
Volapük, have failed because they have not overcome the three main difficulties an IAL must overcome in order to succeed. Those difficulties are: In part III, he presents an idea called the "universal vote", which is a campaign to allot 10 million signatures of people making the following pledge: "I, the undersigned, promise to learn the international language, proposed by Dr. Esperanto, if it shall be shown that ten million similar promises have been publicly given." He argues that this will prevent anyone from wasting time on learning the language since, once 10 million signatures have been gathered, there will be a significant population obliged to learn the language, rendering the language useful. He also welcomes critical feedback for the next year and promises to consider criticism before publishing a special booklet that will give definitive form to the language the following year (which was to be
Aldono al la Dua Libro). Additionally, he lays out guidelines for a language academy to guide the
evolution of the language in the future (which was to be the
Akademio de Esperanto). In the grammar section, he explains the
Esperanto alphabet and sixteen grammar rules. In the dictionary section, he presents a dictionary with 917 roots of vocabulary. ==Reception and legacy==