228 
Journal of Agricultural Research voi. xxvi, no. s 
dency to traverse cell walls. The unidentified mold No. 71218-1 was also 
found to have entered the wood fibers and parenchyma as well as the open 
vessels and resin passages. 
Water solutions of gold chlorid and also of silver nitrate, but to a less 
satisfactory extent, were found to give good differential staining, con¬ 
trasting the mycelium with the host tissue so as to facilitate microscopic 
observation. 
The fact that certain molds may destroy cell-wall substance and that 
many produce a surface discoloration makes it desirable to prevent the 
occurrence of mold in material to be subjected to especially exacting 
uses. 
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