The art of agriculture is the realization of some ideal object. lie who practises it has received from others, without considering the reasons on whi… - Albrecht Daniel Thaer

The science of agriculture rests on experience; and nothing else should be required or expected from it but that which appertains to a practical science. The first principles arise from the perceptions of the senses; but if experience wholly and entirely flowed from these perceptions, the development would not be less the offspring of science and the work of the understanding.

Now, my dear Philippine, a few words more. I am not rich; but my affairs are not in a deranged or desperate state, and were I to die to-day, and my property sold, it would fetch 5,000 dollars at least, so that I possess 2,000 dollars more than my father gave me. I have but 400 dollars salary; my practice is good, and becomes daily more lucrative; the income I derive from it now is more than sufficient to keep a good and respectable house; my prospects are flattering; but I can and must not name them at present; I will not bring them into account.

In the second year of my residence in Gottingen, I entered my name for a course of lectures on practical physics, against the advice of all my friends, but I have never regretted so doing, as there never has been, and probably never will be, a greater man at the university than Doctor Schroder, physician to the king, who gave, at that period, his celebrated lectures on practical physics. Schroder himself was astonished at the step I had taken; but when he perceived that I fully understood him, I became one of his favourite pupils; nor had I the advantage alone of receiving private lessons gratis, but he took me with him in most of his professional visits, where I had all the advantages of his great practice. Thus I caught a putrid fever which was then very prevalent; Schroeder attended me day and night, and giving up all hopes of my recovery, he observed to one of his friends, not thinking that I understood what he said, "The expansion of the sinews increases." "Then," answered I, in a quiet manner, "I shall die in four days, according to such and such a rule of Hippocrates: pray, prepare my father to receive the news of my death." However, immediately after, a sudden turn in the disorder taking place, I soon recovered; not so my memory, which I lost for a time, so that I had forgotten the names of my best friends; my nerves were so completely shaken, that I had no wish to recover. After my recovery, Professor Schroeder being himself attacked with the same fever, requested of his wife that no other physician than myself should attend him; but when he became light-headed, she called in all the physicians of Gottingen, and these gentlemen not agreeing in opinion respecting the treatment of the patient, this great and learned man fell a victim to ignorance and jealousy, April 21, 1772. I cannot think of this celebrated and good man without shedding tears of regret and gratitude.