**4. Conclusions and introduction to next section**

For PET, PS, iPP, PE and N6 glasses, the generation of "ordered part / hole" pairs during the enthalpy relaxation at temperatures below Tg and the subsequent disappearance at the glass transition were discussed under the operational definition leading the criterion of Tg. Thus it was concluded that the unfreezing of the glass parts at Tg was caused by the first order hole phase transition, accompanied by the jumps of free volume, enthalpy and entropy. hh was concerned with the frequency of the absorption bands in the infrared spectrum. In particularly, 1/λ for iPP and PS coincided closely with the respective sensitive bands with physical meaning. In the next section, the generation of "crystal / anti-crystal hole" pairs from the secondary glass in PE crystal lamella was discussed on the DSC curves. The secondary glass was distinguished from the primary glass discussed in the above sections. The Cv ph was also available in the discussion of the cavity radiation from the anticrystal holes filled by photons. The anti-crystal holes were regarded as the lattice crystal made up of photons without the mass.
