El insecto no pretende ser una obra de divulgación científica en sentido estricto, como lo señala su mismo autor, lo cual no significa que su contenido carezca de una base científica. Todo lo contrario. El gran historiador Jules Michelet consultó de manera exhaustiva los trabajos de los naturalistas más relevantes de los siglos que le precedieron , empapándose de los intensos debates que prevalecían entonces, retomando, con su gran erudición, observaciones de unos y otros, y apoyándose en las propias -que no eran pocas- para conformar una visión muy peculiar de la naturaleza. Su capacidad de integrar grandes cúmulos de información confiere una gran coherencia al texto, que fluye de manera apasionada e ininterrumpida, construyendo, con gran detalle, una imagen de los insectos fuertemente humanizada, llena de ejemplos, anécdotas, generalizaciones, reflexiones, comparaciones y, en ocasiones de humor, en donde la naturaleza es un espejo de la sociedad humana. Es el equivalente a Grandville, el magnífico ilustrador, pero en el ámbito de las letras.
His father was a master printer, not very prosperous, and Jules assisted him in the actual work of the press. A place was offered him in the imperial printing office, but his father was able to send him to the famous Collège or Lycée Charlemagne, where he distinguished himself. He passed the university examination in 1821, and was soon appointed to a professorship of history in the Collège Rollin.
Soon after this, in 1824, he married. This was one of the most favourable periods ever for scholars and men of letters in France, and Michelet had powerful patrons in Abel-François Villemain and Victor Cousin, among others. Although he was an ardent politician (having from his childhood embraced republicanism and a peculiar variety of romantic free-thought), he was above all a man of letters and an inquirer into the history of the past. His earliest works were school textbooks. Between 1825 and 1827 he produced diverse sketches, chronological tables, etc, of modern history. His précis of the subject, published in 1827, is a sound and careful book, far better than anything that had appeared before it, and written in a sober yet interesting style. In the same year he was appointed maître de conferences at the École normale supérieure. Four years later, in 1831, the Introduction à l'histoire universelle showed a very different style, exhibiting the idiosyncrasy and literary power of the writer to greater advantage, but also displaying, in the words of the Encyclopedia Britannica, Eleventh Edition, "the peculiar visionary qualities which made Michelet the most stimulating, but the most untrustworthy (not in facts, which he never consciously falsifies, but in suggestion) of all historians."
"L'insetto nasce per se stesso, si muove, va, viene, avanza, ritorna, si gira, se vuole cambia idea, direzione, a seconda dei bisogni, appetiti, capricci. è sufficiente a se stesso, prevede, provvede, si difende, fa fronte agli imprevisti.(...) Nasce avido, capace di assorbire. E proprio l'assorbimento è il servizio che la natura si aspetta da lui."