that I planned to visit, requesting specific statements with regard to the possibility of their being absent from their laboratories during the period from March 1 to July 15. Prom the replies to these letters, a schedule was arranged which enabled me to make connections with every investigator origiĀ¬ nally written to. It is of interest to note that the schedule was rigidly adhered to and throughout the whole trip I failed to see but two of the men I had planned to visit, Professor .Kronecker of Berne and Professor Landergren of Stockholm. Both of these were ill at tno time of ray visit and were unable to receive me. Obviously a large number of individuals who were not in the original programm were mot and consulted with wnile on the trip.