Alexander von HUMBOLDT. 2 L.A.S., [to Mme. Auguste Léo]; on 1 page in-8, and 1 1/2 pages in-12. Thursday. "I have been suffering from a horrible cold for three days, I will be much more stupid than the old men of Orinoco usually are: but how can I refuse an invitation from the excellent and spiritual Madame Sophie Léo! I will obey tomorrow, Friday"... - Saturday. "I am in despair that the kind and witty Madame Léo did not tell me earlier about her academic ambitions. I have sent in vain to Monsieur Renouard [Raybouard], to Bear Martin (Mr. Cuvier)...not a center ticket, not an amphitheater ticket only. My servant has become pulmonary; I have stopped shopping...