==Henri Louis le Chatelier== 

 why did you delete the statement that Le Chattelier did experiments on the chemical secretions of insects? Mexaguil  

 I made some research to write the French article about Le Chatelier and I did not a single information about that. Le Chatelier was a chemist who work on a lots of industrial subject and in particular (but not only) on metallurgical problem. He carried out also some fondamental research. The insect secretion does not really fit with that. But of course, I may not have all the information.