VII. SCIENCE IN 







CELLS. 



135 



are told in next page,) and * very large' he means in 

 proportion to the rest of the branch. How large he 

 does not say, in his text, but states, in his note, that the 

 figure is magnified 26 diameters. I have drawn mine by 

 the more convenient multiplier of 30, and given the real 



FIG. 25. 



size at B, according to Balfour : but without believing 

 him to be right. I never saw a maple stem of the first 

 year so small. 



(2) The black band with white dots round the mar- 

 row, represents the marrow-sheath. 



(3) From the marrow-sheath run the marrow-rays 



