Curtis : Turgidity in Mycelia 9 



on different occasions. It might naturally be supposed that this 

 was due to some faulty application of the plasmolyzing solutions. 

 More tests, however, were made upon Penicillium than upon any 

 of the others in the hope of securing uniform measurements. But 

 the fact remained that there would occur variations of one to three 

 per cent. But this fluctuation does not affect the results of the 

 work because of the practice of comparing every measurement 

 obtained in an experiment with the turgor force of a test plant. 



V. 



3 4 5 



21. 0-4 63 min. 16 — 16 



21.4 " 41 16 16 



21.8 « 76 15 15 



21.8 " 70 13 13 



21.6 » 46 16 16 



22. •« 47 16— 16 



21.4 " 88 16 4- 16 



VI. 



3 4 5 



22.6 4-0 21 10 — 10 



22.8 " 25 10 10 



22.8 " 45 10 10 



22. 38 8+ 8 



u 22 9+ 9 



21.4 << 22 



21.6 •« 50 9 9 



21. •« 42 9 9 



It is very noticeable that the turgor force has a marked influence 

 in regulating the period of recovery. While in Table III. it is 

 more usually over one hour and averages somewhat higher than the 

 table indicates, in Table V. the recovery is decidedly shorter. The 

 same ratio exists in Tables IV. and VI. In the case of Botrytis 

 there was produced by the changes of the substratum a difference 

 of 10 in the turgor force while in Penicillium this only amounted to 

 about 6. The results obtained in the experiments with Mitcor are 

 not so easily explained, for while the period of recovery is shorter 

 than in Penicillium, when changing from 4 to o, the reverse 

 change results in a rather longer period of retardation ap- 

 proximating that of Botrytis. This latter relation would be 

 be expected since the difference in turgor produced by the two 



