I mentioned in a postscript to my last letter that I had called yesterday on M. de Humboldt, whom I had not seen for a long time, in order to speak to him concerning Auguste's affair, but that I did not find him. In former visits I had spoken to him about my position, and told him that I did not well know what course to take with my publisher. He offered to write to him, and did so more than two months ago. Thus far, neither he nor I have had any answer. This morning, just as I was going out, a letter came from M. de Humboldt, who writes me that he is very uneasy at receiving no reply from Cotta, that he fears lest the uncertainty and anxiety of mind resulting from this may be injurious to my work, and begs me to accept the inclosed credit of a thousand francs. . .--Oh! if my mother would forget for one moment that this is the celebrated M. de Humboldt, and find courage to write him only a few lines, how grateful I should be to her. I think it would come better from her than from papa, who would do it more correctly, no doubt, but perhaps not quite as I should like. Humboldt is so good, so indulgent, that you should not hesitate, dear mother, to write him a few lines. He lives Rue du Colombier, Number 22; address, quite simply, M. de Humboldt. . . In the agitation of the moment the letter was not even signed. The following note from Humboldt to Mme. Agassiz, kept by her as a precious possession, shows that in answer to her son's appeal his mother took her courage, as the French saying is, "with both hands," and wrote as she was desired. FROM HUMBOLDT TO MME. AGASSIZ. PARIS, April 11, 1832. I should scold your son, Madame, for having spoken to you of the slight mark of interest I have been able to show him; and yet, how can I complain of a letter so touching, so noble in sentiment, as the one I have just received from your hand. Accept my warmest thanks for it. How happy you are to have a son so distinguished by his talents, by the variety and solidity of his acquirements, and, withal, as modest as if he knew nothing,--in these days, too, when youth is generally characterized by a cold and scornful amour-propre. One might well despair of the world if a person like your son, with information so substantial and manners so sweet and prepossessing, should fail to make his way. I approve highly the Neuchatel plan, and hope, in case of need, to contribute to its success. One must aim at a settled position in life. Pray excuse, Madame, the brevity of these lines, and accept the assurance of my respectful regard. HUMBOLDT. The letter which lifted such a load of care from Louis and his parents was as follows:-- HUMBOLDT TO LOUIS AGASSIZ. PARIS, March 27, 1832.