August 13, 1931 I desire to acknowledge the receipt of your letter of July 11th, which has been forwarded to me at this sea-side resort, whither I have come to obtain some badly needed rest from work and official duties. I do not understand what reason you can possibley have for taking exception to what is recorded upon the bronze labels which I had made and placed on the base of the effigy of the Diplodocus, which is installed in the Museum of Natural History in the City of Mexico. The label does not give any names but tht of the donor Mrs. Andrew Carnegie. The label state that she made the gift in 1928, at which time every body knows that you were the Directior of the Museum, the label further states that the specimen was installed by myself and my assistant, Mr. Coggeshall in May, 1930. At that time Dr. Ocheterena had become your successor, but neither his name nor yours was placed upon the tablets, which recite the circumstances of the gift, but do not recite the history of the negotiations which related to the same. It is not customary on such tablets to revite at lenght all the facts incident to the making of the gift. We of this extraordinary animal placed in any museum