On the Influence of Inorganic Salts upon the 

 Conidia-formation of Aspergillus niger. 



{Preliminary Note.) 



By 

 Atsushi Yasuda, Rigakuslii. 



To our knowledge of the influence of changed external conditions upon 

 various kinds of moulds many interesting contributions have hitherto been 

 made. Recently, the investigations towards this branch of physiology seem 

 to be of especial abundance. Eschenhagen 1 ) has studied the effects of 

 cane-sugar, glycerine, sodium and potassium nitrates and sodium and calcium 

 chlorides on Aspergillus niger, Penicillium glaucum and Botrytis einerea. 

 Schostakowitsch 2 ) has investigated the conditions wanted to the conidia- 

 formation of Fumago, Hormoderulron, Dematium &c. He has also given 

 in another paper 3 ) the like about Mucor proli/erus. The fact that hetero- 

 geneous forms of Thamnid ium elegam depended on the chemical nature 

 of substrata, their degrees of concentration, liquidity, moisture ami tem- 

 perature has been demonstrated by the experiments of Baohmann*), and 

 also that various modes of growth of Basidiobolus ronarum were influenced 

 by the characters of liquid-media has been noticed by Racirorski 5 ). 



Klebs gave in his great work'"') detailed accounts concerning the forma- 

 tion of the reproductive organs of Eurotium repens and Mucor racemosvs. 



x ) F. Eschenhagen. Ueber den Einfluss von Losungen verschiedener Concentration 

 auf das Wnchsthum von Schimmelpiken. Stolp 1S89. S. 10. 



2 ) W. Schostakowitsch. Ueber die Bedingungen der Conidienbildung bei Russ- 

 thanpilzen. Flora. 1895. Bd. LXXXT. S. 362-393. 



3 ) W. Schostakowitsch. Einige Yersuche iiber die Abhangigkeit des Mucor pro- 

 liferus von den iiusseren Bedingungen. Flora. 1897. S. 88-9G. 



*) J. Bachmann. Einfluss der iiusseren Bedingungen auf die Sporenbildung von 

 Thamnidium elegans Link. Bot. Ztg. 1895. Abt. I. S. 129-130. 



5 ) M. Raciborski. Ueber den Einfluss liusserer Bedingungen auf die Wachsthums- 

 weise des Basidiobolus ranarum. Flora. 1896. Bd. LXXXII. S. 110-121. 



6 ) G. Keebs. Die Bedingungen der Fortpflanzung bei einigen Algen und Pilzen. 

 Jena 1896. S. 446-532. 



