76 THE SUGAR BEET. 



If we now examine a plant having two leaves more 

 than the above, in the exterior zone of the parenchyma 

 can be seen traces of a transparent tissue. Little by 

 little this becomes larger, and will finally form a com- 

 plete circle, and the vessels will soon become apparent, 

 the new formation is consequently composed of vascu- 

 lar cells, and a transparent zone situated on the other 

 side. This is separated by a medullary zone that was 

 before colored, and the utricles situated between each 

 zone of the vascular groups have diluted communica- 

 tion, while those of the centre become isolated. The 

 new groups that appear near the circumference are 

 composed of elongated utricles. The root consequently 

 increases in size when the diameter of the utricles be- 

 comes large, and others form, this occurring at the 

 same time. Knowing the above facts, we should con- 

 clude in advance that in all i3robability each cycle of 

 leaves^ corresponds to a given zone, and, as the new 

 formations are concenti'ic to the first, the outer or older 

 leaves^ communicate with the inner zone the richest in 

 sugar. 



Several of the most prominent men have made nu- 



' AVe have analyzed upon various occasiotis the various zones, and found for 

 the outer zone 9.6 per cent, of sugar, 2d zone 10.2 per cent., 3d zone 11.3 

 per cent,, 4th zone 12 per cent., etc. See " Leaves of the Sugar Beet." 



2 Basset contends that the above is not correct, and that if there existed 

 any communication between the zones and the leaves it would be in a different 

 manner ; in other words, that the outer cycle of leaves corresponds to the outer 

 zone ; the former having a new development from the centre, the same phe- 

 nomena should exist with the latter. 



