1. A large fraction of the work reported here has been obtained in a few institutions. The main contributions are from Batelle Memorial Institute, Geneva (K. A. Müller)
2. The Hebrew University, Jerusalem (W. Low)
3. Naval Research Laboratory (V. J. Folen)
4. Oxford University, England (W. P. Wolf)
5. Raytheon Research Division (L. Rimai and G. A. deMars)