4 6 



RUBBER AND 



dissolution of the cell-walls are seen in Figs. 8 and 9. 

 Fig. 8 represents a tangential section of a network very 

 close to the cambium, whilst that shown in Fig. 9 is 

 older and further away. 



In the seedling the nodes of the network may be 

 partly formed by tubular outgrowths of the cells which 

 meet and fuse together, thus recalling the behaviour of 



Hevea transverse section of bark x 5. The tangential 

 lines represent groups of latex vessels. 



latex tubes proper. Fig. 10 shows such a fusion in a 

 transverse section of the seedling. But in the secondary 

 laticiferous tissue derived from the cambium there is 

 hardly any outgrowth of this kind. The complete net- 

 work is laid down in situ. 



In material which has been preserved in strong 



