Your prospectus is full of interest, and does ample justice to those who have provided you with materials. To name me among them was an affectionate deceit, the ruse of a noble soul like yours; I am a little vexed with you about it.* (* The few words which called forth this protest from Humboldt were as follows. After naming all those from whom he had received help in specimens or otherwise, Agassiz concludes:--"Finally, I owe to M. de Humboldt not only important notes on fossil fishes, but so many kindnesses in connection with my work that in enumerating them I should fear to wound the delicacy of the giver." This will hardly seem an exaggeration to those who know the facts of the case.) Here is the beginning of a list. I think the Department of the Mines de Province will take three or four more copies. We have not their answer yet. Do not be frightened at the brevity of the list . . .I am, however, the least apt of all men in collecting subscriptions, seeing no one but the court, and forced to be out of town three or four days in the week. On account of this same inaptitude, I beg you to send me, through the publisher, only my own three copies, and to address the others, through the publisher also, to the individuals named on the list, merely writing on each copy that the person has subscribed on the list of M. de Humboldt. With all my affection for you, my dear friend, it would be impossible for me to take charge of the distribution of your numbers or the returns. The publishing houses of Dummler or of Humblot and Dunker would be useful to you at Berlin. I find it difficult to believe that you will navigate successfully among these literary corsairs! I have had a short eulogium of your work inserted in the Berliner Staats-Zeitung. You see that I do not neglect your interests, and that, for love of you, I even turn journalist. You have omitted to state in your prospectus whether your plates are lithographed, as I fear they are, and also whether they are colored, which seems to me unnecessary. Have your superb original drawings remained in your possession, or are they included in the sale of your collection?. . .