436 Canadian Record of Science. 



2. This deformation, when carried out at ordinary 

 temperatures, is due in part to a cataelastic structure 

 and in part to twinning and gliding movements in 

 the individual crystals comprising the rock. 



3. Both of these structures are seen in contorted 

 limestones and marbles in nature. 



4. When the deformation is carried out at 300° C, 

 or better at 400° C, the cataelastic structure is not 

 developed, and the whole movement is due to changes 

 in the shape of the component calcite crystals by 

 twinning and gliding. 



5. This latter movement is identical with that 

 produced in metals by squeezing or hammering, a 

 movement which in metals, as a general rule, as in 

 marble, is facilitated by increase of temperature. 



6. There is therefore a flow of marble just as there 

 is a flow of metals, under suitable conditions of 

 pressure. 



7. The movement is also identical vdth that seen 

 in glacial ice, although in the latter case the move- 

 ment may not be entirely of this ■ character. 



8. In these experiments the presence of water was 

 not observed to exert any influence. 



9. It is believed, from the results of other experi- 

 ments now being carried out but not yet completed, 

 that similar movements can, to a certain extent at 

 least, be induced in granite and other harder crystal- 

 line rocks. 



