Much space is devoted to evidence and arguments supporting the crystallite theory of glass structure which in most cases is regarded as entirely different from the Zachariasen random network theory. However, some of the Russian scientists feel that the theories must he combined. Thus G. B. Bok" states "There are no irreconcilable differences between the orystallite and the Zacheriasen theoriesthey are two aspects of the same question. Glass contains regions of greater order, RALPHE. OESPER which can he termed crystallites, since the Unive~sityof Cincinnati repeat peperiods correspond to the repeat Cincinnati. Ohio periods found in crystalline silicates, and regions of l e a order. But even in the ordered regions the degree of order should be less than in silicate crystals. The Gmelins Handbueh der Anogonirchen atoma which form the oxygen bridges Chemie. System No. 3. Oxygen linking these two types of regions-ordered Section 3: Elementary Oxygen and disardered-cannot, in principle, be attributed to either type of region, so that Edited by the Gmelin Institute under we have a continuous transition and there the direction of E. H. E. Pielsch. 8th ed. are no phase boundaries between the Verbg Chemie, GmbH, Weinheim crystallites." 518 pp. 100 Bergstr., 1958. xi These remarks present vhat appears to graphs. 17.5 X 25.5 cm. Paper hound, he the general conolusian reached by a $67.92. majority of more than 500 participants in Tlrir further tierriun of thr eighth rd~tivn the Conference. However, there remained considereble differences of opinion of gun el is'^ tlandlmok has hwn aswnolrd between different schools. The great need with tllc urml
