[4/18.]
"Souvenirs entomologiques," 1st series, chapter 13.

[4/19.]
He was subject in his youth to violent headaches, "which sometimes developed into a cerebral fever," as well as strange nervous troubles: "A few days ago I was attacked, at night, with a sudden nervous illness, of a terrifying nature, which I have not as yet been able to identify." To his brother, 3rd September, 1848.

Severe disappointment or annoyance always had a great effect upon him; on the occasion of his first marriage he fell into a sort of cataleptic condition as a result of the opposition of his parents and relations, who sought to oppose it. (Conversations with his brother.)

[4/20.]
"Souvenirs entomologiques" 9th series, chapter 23.

[4/21.]
Id., 10th series, chapter 22.

[4/22.]
Letter to Lèon Dufour, 1st February, 1857.

"Steps have been taken to obtain for me the post of drawing-master (maître des travaux graphiques). If they succeed, thanks to the little talent I have for drawing, my salary will reach a reasonable figure, 120 pounds sterling, and I can then, by giving up these abominable private lessons, cultivate rather more seriously the studies into which you have initiated me." Communicated by M. Achard.

[4/23.]
"Souvenirs entomologiques" 10th series, chapter 22.

[4/24.]
Oubreto Prouvençalo. La Cigale et la Fourmi.

[4/25.]
Lavisse. A minister. Victor Duruy.