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520 MR. S. LE M. MOORE'S STUDIES 



acid. In the sieve-tubes, on the other hand, there is upon the 

 sieve-plates a substance which gives proteid reactions ; two of 

 these are shown in Plate XIV. figs. 11 and 12. It is evident 

 that the callus of the trumpet-hyphae is altogether different in 

 constitution from that of the Vegetable-Marrow, and probably 

 it is produced by mucilaginous degeneration of the cell-wall ; 

 moreover, it is unacted on by a peptonizing fluid. 



I cannot conclude without recording my obligations to the 

 authorities of Kew and the Natural-History Museum, through my 

 friends Mr. J. Gr. Baker and Mr, George Murray respectively, 

 for their kindness in providing me with material of Ballia and 

 Macrocystis. 



Summary. 



1. Vegetable-Marrow callus gives with great clearness all the 

 three chief proteid reactions ; it is also dissolved by a peptonizing 

 fluid ; it is hence a typical proteid. 



2. The callus cannot be pressed from the sieve, for (a) it is a 

 proteid, (b) when it undergoes gastric digestion the sieve-plate is 

 cleared, and is then left in its pristine condition. 



3. The statements of the foregoing paragraph are supported 

 by the entirely different reactions shown by wall and callus re- 

 spectively, 



4. itoZZ/a-stoppers give all three proteid reactions, but are not 

 attacked by a peptonizing fluid. They stain in the same way as 

 does callus, except that they take a rich brown with iodine alone 

 and are untouched by aniline-blue. 



5. The stoppers react altogether differently from the wall, and 



extent 



The 



evidence of differentiation within their substance, as seen when 

 boiled in Millon's fluid, and the fact of their disappearance under 

 action of Schulze's macerating fluid into plasma-balls which still 



with iodine, speak for their similarity with cell- 



brown 

 protoplasm. 



6. The group of bodies allied to proteids, such as mucin, nuclem, 

 chondrin, &c., contains none which gives in a typical fashion all 

 three proteid reactions. Hence the substance of IteWw-stoppew 



should not be classified with them. 

 7. The 



Marrow has many 



of the 



characters of, and should probably be classed with, the Coagulated 























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