1. In some cases the conclusions stated are those of the experimenters in the references, in others they are conclusions drawn by the present author or in other quoted theoretical work. It should be emphasized that the type of summary statement made here cannot be properly qualified. For a variety of reasons not all of the conclusions stated are equally reliable. The references given are intended to be representative and, in no sense, complete.
2. See references in bibliography.
3. Some theoretical estimates of the mobility inp-type3–5compounds have been made by Hilsum (Hil 60) on the basis of polar scattering. In this connection see (Ehr 60), reference 25.
4. In addition, the previous measurements of Howard and Paul (How 59) which were quoted in (Ehr 60) were repeated by Howard on purer samples. The new results agree more closely with the dashed curve in Fig. 4 of (Ehr 60) and thus increase the consistency between the pressure and Hall data (Auk 60). In the low-pressure range, too (Fig. 4 inset), the agreement between theory and experiment is markedly improved.