"A natural arrangement is one which is based on all parts of the plant."

"The Creator's hand is visible in every part of creation."

"I have established a new era in natural history."

"Natural bodies are divided into three kingdoms of nature: viz. the mineral, vegetable, and animal kingdoms. Minerals grow, Plants grow and live, Animals grow, live, and have feeling."

"Nature's economy shall be the base for our own, for it is immutable, but ours is secondary. An economist without knowledge of nature is therefore like a physicist without knowledge of mathematics."