168 Canadian Record of Science. 



tions, for the carrying out of which the hole is being sunk. 

 When these observations are completed, drilling will be 

 resumed and continued as far as possible. The diameter of 

 the hole at the bottom is *7 cm. (about 2.8 inches). The 

 rod of the drill is composed of Mannesman tubes, without 

 which it is doubtful if the present great depth (through 

 hard rock) could have been reached. 



Note to Paper on Viscometry. 

 It should be mentioned that the above experiments were 

 made with my viscometer in its original form, employing 

 the Eedwood nozzle. 



Erratum. 



In Vol. VI., No. 2, p. 91, on top line, for the word 

 anticlinal read synclinal. 



