Jean-Baptiste-François GIGOT D'ORCY (1755-1793), naturalist, entomologist and mineralogist, he had created an important cabinet of natural history in his residence of the place Vendôme. Autograph letter signed to the botanist Charles-Louis L'Héritier de Brutelle (1746-1800). 1 p. in-4. Dated "16 January", address on the back. Negotiations for the purchase of birds and insects for his natural history cabinet. "Once again, Sir, I thank you for your good intentions and for the preference you have shown me. I had foreseen that our amateurs would not want to overpay for Mr Frazer's insects, in order to have some rare ones to overpay for more common ones in very poor condition, I made him offers above what he would find in the evening and I even added that he could come back to me once I was certain that others would not pay him what I was offering. He has not shown me his birds and is due to leave tomorrow, taking his junk to England. I have no (?) interest in reptiles, but I am willing to add something to my offer, so that he will also reduce the size of his collection and leave us his birds and insects, because he says they have cost him a great deal of trouble and a great deal of money and cannot be paid for at his estimate [...]".