7T4 



amber forest; the pathological condition was the rule; the normal one, the 

 exception."^ We cannot better present the processes of resinosis than by 

 showing copies of the aml^er sections wliich Conwentz has reproduced (Figs. 

 158-161). 



Just as at present, we find that tlie process of resinosis began as follows: 

 — resinosis and liquefactif)n of the membranes, and finally of the whole n-U 



Pis'. 15S. Process of turning- to resin, beginning- with the formation ot 

 resin canal in the wood. 205:1. (After Conwentz.) 



a lysigenouF 



Fig. 159. Horizontal section. In the summer wood of an annual ring is a group of 



abnormal wood parenchyma cells (P). .56:1: The holes in the tissue were produced 



in sectioning. (After Conwentz.) 



together with its contents, set in in diiYerent groups between two medullary 

 rays (Fig. 158). No anatomically different tissue is necessarily present 

 here, but, in the majority of cases, such an one is present and in. fact in the 

 form of wood parenchyma which develops in tangential strips. Conwentz 



1 Conwentz, Monographie der baltischen Bernstoinbiiumc, Danzig, 1S90, p. 145. 



