81 



trations. Mucor stolonifer was already injured in a 1 % solution and 

 could not germinate in 1.5 %. 



II Chinoline-group y ). — 



(b) Quinine chloride. This salt is comparatively hard to dissolve, so 

 that at the room-temperature the point of saturation is reached only just 

 above 1 o/ . All fungi develop well in any concentrations, of which 0.5 o/ 

 was proved to be the optimum concentration for their growth. The 

 following table will show this relation more clearly : 



Name of fungi 



Control-culture 



0.2 % quinine 

 chloride 



0.5 % quinine 

 chloride 



1 % quinine 

 chloride 



Dried substance 

 (in grams) 



Dried substance 

 (in grams) 



Dried substance 

 (in grams) 



Dried substance 

 (in grams) 



Penidllium glaucum 

 Aspergillus niger 

 JBotrytis einerea 

 Mucor stolonifer 



0.069 

 0.242 

 0.151 

 0.053 



0.171 

 0.274 

 0.162 

 0.073 



0.211 



0.286 

 0.313 

 0.098 



0.194 

 0.289 

 0.157 

 0.040 



(c) Cinclionine chloride. Aspergillus niger and Penidllium glaucum 

 were able to germinate in solutions of more than 4 %. As a matter of 

 fact, however, in the concentrated solutions the fructification was much 

 impeded. Boirytis einerea and Mucor stolonifer were able to accommodate 

 themselves to solutions of weaker concentrations. 



(d) Strychnine cUoride. Until the limit of saturation (about 2.5^) 

 is reached none of our moulds showed signs of any poisonous actions of 

 this salt. 



(e) Veratrine sulphate. In higher concentrations of the culture-media 

 the fructification was more and more reduced, till finally only the sterile 

 hypha3 were produced. Penidllium glaucum and Aspergillus niger were 

 able to develop in the solutions of 4.5 o/ and stronger concentrations, 

 Botrytis einerea in much weaker, and Mucor stolonifer in still weaker 

 ones. The gradual reduction of fructification in proportion to the medium- 

 concentration was especially remarkable in the Aspergillus-culiuYe ; that is, 

 from 1.5 % the sterile portion of the mycelium increased, in 3 o/ a few 

 spores were formed, in 3.5-4 o/ only traces of conidia appeared, and in 

 4.5 o/ they were entirely suppressed. 



J ) V. v. Richter. loc. cit. p. 615. 



