[15/16.]
Id., 6th series, chapter 11.
[15/17.]
Conversations.
NOTES TO CHAPTER 16.
[16/1.]
Letter to his brother, 4th February, 1900.
[16/2.]
To his brother, 18th July, 1908. At this time the eighth volume of his "Souvenirs" had just appeared, and the ninth was in hand.
[16/3.]
Id.
[16/4.]
"Chimie agricole."
[16/5.]
To his brother, 10th October, 1898.
[16/6.]
Private letter, 30th March, 1908.
[16/7.]
Id.