PREFACE. 



Section I — IV of Dr. P. H. Schotjte's great treatise on this 

 subject have been inserted in the transactions of the Academy 

 Vol XI — 3 and 5. He was engaged in finishing it by writing out 

 the fifth and last section when his sudden and much lamented 

 death prevented him from giving' the final touch to his creation. 



Fortunately the manuscript was found amidst the deceased's 

 papers. Though it bore the character of a concept, still the plan 

 was quite ready and it revealed the rigor and lucidity which 

 characterise all Schoute's scientific works. So it might well serve 

 for the final redaction. 



In the meeting of the Academy of Jan. 29, 1910 1 gave a 

 short account of the manner in which this redaction was performed 

 and of the great part that Dr. W. A. Wythoff had in it ; so I 

 now have only to repeat my thanks to him. 



J. CAR DIN AAL. 



