Monsieur M. Boule Museum d' Histoire Naturelle, Paris, France. My Dear Doctor Boule; Your very kind line of 24th of February have just been received this morning. I am also in receipt of a letter from Monsieur Perrier, the Director. I am sure that the whole matter rests in good hands, and I commit all the arrangements in reference to the bases and the cost of the same, &c, to you and your associates at the Museum, knowing that I can rely implicitly upon your excellent judgment in all these matters. Our only wish is that you be pleased. As to the matter of securing for you photographs of the quarries where the Diplodocus was obtained and all that, it will give me great pleasure to do everything in my power to assist you. I shall immediately give instructions to have photographs prepared. I may inform you that I have a fine set of latern slides which I have myself used and which I employed when I was in London in order to illustrate a lecture which I delivered myself before the Zoological Society in London upon the Diplodocus, &c. Since that time our knowledge of this great beast has of course advanced considerbly. I suppose you have our various publications upon the subject. If not, please let me know at once and I will see that you receive them. I am under the impression, however, that I have sent copies to you. Your proposal to give an illustrated lect-