( 457 ) 
occurring among others for C a H a -|- CH s OH, C 2 H s OH, etc.) could 
occur for perfectly normal substances. 
e. In T. and K’s paper it says in a footnote on p. 242 that in 
later papers I should have left out a dotted line, occurring on the 
plate of an earlier paper, “probably because the special suppositions 
of van Laar render the occurrence of the required homogeneous 
double plaitpoints impossible for normal substances.” 
I have only omitted the case represented by this line because the 
different course (either to the left or to the right) of the p-T -line 
was totally unessential for my investigations. But by no means 
because my special suppositions would render the occurrence of these 
double plaitpoints impossible for normal substances. On the contrary 1 
/. The inaccurate remark on p. 242 at the bottom of T. and K’s 
paper beginning: “In van Laah’s later paper” will not call for any 
further refutation after the above remarks. Of the seven papers 
published by me on this subject, Mr. T. and Mr. K. seem to have 
read only two, those of March and May J905. All the following 
papers, in which the investigation of the first two was continued, 
have apparently escaped their notice, particularly the papers mentioned 
above under a. 
In conclusion I will only remark that type II has by no means 
been modified by me, and that I have proved (Teyler loc. cit.) that 
such an intricate system of plaits is certainly possible on my “ simple ” 
suppositions, and that I have nowhere thought I had to ascribe the 
occurrence of this type to abnormality (See above sub a). On the 
contrary I asserted the very opposite , as clearly appears from the 
above quotation from my paper of Sept. 1906 These Proc. : “So it 
appeared” etc. p. 227. 
And this, I think, refutes sufficiently all Messrs. Timmermans and 
Kohnstamm’s remarks in reference to me. 
Baam, Nov. 15, 1909. 
(December 23 , 1909 ). 
