89 



Sodium salts. 



Control- culture.— On the 4th clay after sowing white conidia were 

 formed, which became yellow on the 5th and dirty brown on the 7th. 

 The other details were quite the same as in the case of potassium salts. 



a. Sodium chloride. 1 ) — A 5 96 -culture produced white conidia on 

 the 6th, which were tinged dirty brown on the 13th and blackened on the 

 18th. In 10% conidia were white on the 7th, yellow on the 13th, dirty 

 brown on the 18th and black thereafter. 15% after a month formed 

 short-stalked coniclia-fruits, which never densely developed. In these cultures^ 

 as the concentration of the medium ascended the reproductive organs 

 diminished in size : so conidia- fruits and conidia-bearing hyphae were in 

 5% 0.7 mm thick and 2.5 mm long respectively, while in 15% 0.4 mm 

 thick and 1.2 mm long respectively. Moreover a remarkable thickening 

 of the cell-wall of conidia-bearing hyphae characterized the cultures of this 

 salt. 



b. Sodium bromide. — The general fates of 5-20% -cultures were nearly 

 the same as those of the corresponding potassium salt. 



c. Sodium iodide. — A 5% -culture showed a slow development of 

 conidia-fruits, which were long-stalked and of various sizes, as we saw 

 in the case of the potassium salt. The other cultures are now in the 

 course of experiment. 



d. Sodium nitrate. — 5-20% -cultures were experimented with. The 

 mode of reduction of conidia-fruits in the media of stronger concentration 

 was similar .to that of potassium nitrate. 



Ammonium salts. 



Control-culture. — As above. 



a. Ammonium chloride. — A 5 %-culture formed white conidia on 

 the 5th day after sowing, the greater part of which changed to dirty 

 brown, and the rest to black on the 7th. Ripened conidia-fruits were larger, 

 giving a diameter of 0.7 mm. Conidia in a 10 %-culture were white on 

 the 7th, brown and black on the 15th. Conidia-bearing hyphae were much 

 shorten eel — 1 .8 mm . 



b. Ammonium bromide.— 5-20% -cultures showed the usual phenomena. 

 Nothing particular could be observed. 



x ) As our fundamental medium-solution contained '6S% of this salt we must here, 

 for strict measurement, add 3.6 to the percentage number of each culture. 



