n6 Mr. Thomas Hick on 



objection to this combination, as it is well known that the 

 arrangement of the mechanical tissues of stems generally 

 differs from that of roots. 



Note added October i6t/i, 1894.. 



When the preceding paper was completed and Professor 

 Weiss had undertaken to communicate it to the Society, I 

 learnt from Professor Williamson that he and Dr. Scott, 

 working upon the same plants, had also reached the con- 

 clusion that Kaloxylon is the root of Lyginodendron. They 

 sent a joint paper on the subject to the Royal Society, which 

 was read on the 31st of May, and on July 12th, in reporting 

 the proceedings of the Society, Nature gave a brief abstract 

 of the same. From this it appears that these authors have 

 obtained specimens of Kaloxylon " in actual continuity with 

 the stem of Lyginodendron" and arising from it in a 

 manner which proves the former to be the adventitious 

 root of the latter. 



Meanwhile, Professor Weiss had forwarded my 

 paper to this Society on May 31st, so that the two papers 

 are perfectly independent of one another. This fact is of 

 itself additional proof of the truth of the conclusion reached 

 in both cases, but it is all the stronger from the further fact 

 that the methods employed are different. Nothing, of 

 course, can be more conclusive than the evidence of 

 specimens which are found in organic connection with one 

 another, and on this account the conclusions reached by 

 Williamson and Scott need no confirmation. But in the 

 case of fossil plants evidence of this kind is not always to 

 be had, and we are driven to rely largely upon the method 

 of comparative anatomy. This is the method followed in 

 the preceding paper, which, whatever be its merits or 

 demerits in other respects, at least shows the utility of that 

 method when carefully applied. 



