28 Vi rt-ÄS m :\i. t.'i «w iV^ "-> .'ti « ft^j »f ■« 



method, tlurc may be so many sources of inaccuracy as to make one accept 

 the results of tlic experiment simply as relati\'e and not as absolute. 



There occured occasionally abnormally good or poor development of the 

 fungus in some cultures. I ha\-c omitted such cultures. 



(V^) In the second series, the cultures which contained tannin liigher 

 thaTi 045^^' were ol)ser\ed. The greater jiart of the cultures did not 

 dc\elüj) so well as to enable me to weigh the nnxelium. I have, therefore, 

 classified them by the a]ipcarance of the cultures. 



Suiial Xi). IVrcciitage of Development of 



tamiin mycelium 



1 1 045 fair 



12 0.50 a little 



13 0.55 slight 



14 0.60 



15 0.65 trace 



16 0.70 „ 



17 0.80 „ 



18 ' 090 „ 



19 T.oo „ 



20 1. 10 „ 



21 1.20 „ 

 23 1.30 „ 



