The opinion that they are inferior in the faculties of reason and imagination, must be hazarded with great diffidence. To justify a general conclusion, requires many observations, even where the subject may be submitted to the anatomical knife, to optical glasses, to analysis by fire or by solvents. How much more then where it is a faculty, not a substance, we are examining; where it eludes the research of all the senses; where the conditions of its existence are various and variously combined; where the effects of those which are present or absent bid defiance to calculation; let me all too, as a circumstance of great tenderness, where our conclusion would degrade a whole race of men from the rank in the scale of beings which their Creator may perhaps have given them. To our reproach it must be said, that though for a century and a half we have had under our eyes the races of black and or red men, they have never yet been viewed by us as subjects of natural history. I advance it, therefore, as a suspicion only, that the blacks, whether originally a distinct race, or made distinct by time and circumstances, are inferior to the whites in the endowments both of body and mind. It is not against experience to suppose that different species of the same genus, or varieties of the same species, may possess different qualifications. Will not a lover of natural history, then, one who views the gradations in all the races of animals with the eye of philosophy, excuse an effort to keep those in the department of man as distinct as nature has formed them?[80] He was impressed, however, with the integrity of the Negroes and paid them the following tribute: Notwithstanding these considerations which must weaken their respect for the laws of property, we find among them numerous instances of the most rigid integrity, and as many as among their better instructed masters, of benevolence, gratitude, and unshaken fidelity.[81] V In later years it seems that Jefferson changed from his position of certainty as to the inferiority of the Negro to that of doubt. At one time he believed in the possibilities of the Negro and then again he receded from that position to take up the argument that the blacks lack the capacity with which the whites are endowed. Jefferson shows that he was either ill-informed or insincere. Writing to General Chastellux in 1785 concerning the future of the Negro Jefferson remarked: I have supposed the black man, in his present state might not be in body and mind equal to the white man; but it would be hazardous to affirm, that, equally cultivated for a few generations, he would not become so.[82] To Benjamin Banneker, the surveyor and astronomer, who was regarded by some as his friend, he addressed the following in 1791: