[3] Janet graduated from the École Centrale Paris in 1872,[1]: 57  and worked for some years as a chemist and engineer in a few factories in Puteaux (1872), Rouen (1873–74), and Saint-Ouen (1875–76).

He married Berthe Marie Antonia Dupont, the daughter of the owner, in November 1877, and worked there for the rest of his life, finding time for research in various branches of science.

He was an inventor and designed much of his own equipment, including the formicarium, in which an ant colony is made visible by being formed between two glass panes.

[6] In 1927 he turned his attention to the periodic table and wrote a series of six articles in French that were privately printed and never widely circulated.

Before the end of his studies, the French Academy of Sciences regularly published his research in its reports and awarded him the Thore Prize in 1896.

[2] A large part of the collection included fossils from regional deposits that have now disappeared or are almost inaccessible, such as the Bracheux Sands (partially covered by the expansion of the city of Beauvais).

[14] Other local tertiary deposits are represented, such as the Ypresian and Lutetian from the regions of Chaumont-en-Vexin, Parnes, Grignon, Chambors, and Mouy.

He demonstrated that these muscles evolve into lipid cells, providing the necessary energy for this queen who does not feed during the long months it takes to establish her colony.

[5] Maurice Maeterlinck wrote: It is necessary to mention the engineer Charles Janet, whose countless studies, research, communications, monographs, precise, clear, impeccable, and adorned with anatomical plates that have become classics, have continued, for nearly fifty years, to enrich myrmecology as well as many other sciences.

[24]Building on his studies of insect metamerism, Janet sought to conceive a common ancestor for animals and plants.

A few years later, a theory called orthobiontics[26] emerged in which Janet outlined an organization plan for living beings.

Ultimately based on excessive theorization that takes precedence over his observations, undermined by a text filled with complex neologisms, all translated into mathematical language, this theory remained inaccessible.

[29] Moreover, the perfect regularity he observes at all levels of his table is, for Janet, proof that he has discovered the correct distribution law.

Janet started from the fact that the series of chemical elements is a continuous sequence, which he represented as a helix traced on the surfaces of four nested cylinders.

By various geometrical transformations he derived several striking designs, one of which is his "left-step periodic table", in which hydrogen and helium are placed above lithium and beryllium.

The table therefore corresponds to the Madelung rule, which states that atomic subshells are filled in the order of increasing values of (n + ℓ).