430' Canadian Record of Science. 



2. At 300° C. in the absence of moisture. (Hot 



dry crush.) 



3. At 400° C. in the absence of moisture. (Hot 



dry crush.) 



4. At 300° C. in the presence of moisture. 



(Hot wet crush.) 



Eight experiments were made on marble columns 

 at the ordinary temperature, in the absence of 

 moisture, the rate at which the presure was applied 

 differing in different cases, and the consequent 

 deformation being in some cases very slow and in 

 others more rapid, the time occupied by the experi- 

 ment being from ten minutes to sixty-four days. The 

 amount of deformation was not in all cases equal, 

 as some of the tubes showed signs of rupture sooner 

 than others. On the completion of the experiment, 

 the tube was slit through longitudinally by means of 

 a narrow cutter in a milling machine, along two lines 

 opposite one another. The marble within was found 

 to be still firm and compact, and to hold the respec- 

 tive sides of the tube, now completely severed from 

 one another, so firmly together that it was impossible 

 without mechanical aids to tear them apart. By 

 means of a steel wedge driven in between them, how- 

 ever, they could be separated, but onlv at the cost of 

 splitting the marble through longitudinally. The 

 half columns of the marble now deformed generally 

 adhere so firmly to the tube that it is necessary to 

 spread the latter in a vice in order to set them free. 

 The deformed marble, while firm and compact, differs 

 in appearance from the original rock in possessing a 

 dead white colour, somewhat like chalk, the glisten- 

 ing cleavage surfaces of the calcite being no longer 



