'I'he specific heat and dimensior~al changes of the porous !)6yo silica glass -\\later s).stem n-ere measured simultaneously between -35 "C and +2 'C with coverages of 1.6, 4.0, 5.3, cuid '7.7 molecular layers. 'I'he specific heat of the adsorbate below the transition range was found to be higher than that of ice. Xo phase change was detected with the lowest concentration. At the higher coverages, transition always occurred near -0.5' a~l d was of the anomalous first order type. The values of the specific latent heat of fusion, calculated by assuming that. two monolayers do not freeze, are 40.4, 54.4, and 5S..i cal g-l, deperiding on the concentr;~tion. 'I'he correlation between the results of calorimetric and dimensional change measuretiielits 1v;is considered s;~tisfactory.