When he was 14 years old, Jean Victoire Audouin (1797—1841), allowed him access to the laboratory of the Muséum national d'Histoire naturelle.

This last work is remarkable: it presents in a precise way the harmful or pest species and the damage they cause to various crop plants.

He argued that Charles Darwin's pigeon studies were unscientific and that his ideas about evolution were false and unoriginal.

[1][2] In 1870, Blanchard and Charles-Philippe Robin opposed the election of Darwin as a corresponding member of the French Academy of Sciences.

This publication raised his hopes to obtain the chair of reptiles and fish at the Natural History Museum left vacant by the death of Auguste Duméril (1812—1870) but it was finally Léon Vaillant (1834—1914) who was selected.