Physiologie. — Eumycetes. 229 



The surnmary of results runs as follows: 



In the seed covering of Orysa sativa and of Zea Mays selecüve 

 permeability is observed. The seat of the selective-permeable septum 

 in the Orysa grain is most probably confined to the cutinized inner 

 wall of the inner integument which lies directly above the aleurone 

 layer in the füll}'- matured grain. 



The germinative power of the desiccated huUed grain of Orysa 

 is slightly affected by twenty-four hours' steeping in 6 N sulphuric 

 acid, Chloroform, acetone, ethyl ether, commercial absolute ethyl 

 alcohol, picric acid (aqueous Solution), and the ethyl alcohoJic (com- 

 mercial absolute) Solution of thymol, naphthalene and «-naphtol, 

 whereas the air-dried grains are killed by similar treatment. Like- 

 wise in the case with Zea, 5 N sulphuric acid, hydrochloric acid 

 (twenty one hours), commercial absolute ethyl alcohol, and the ethyl 

 alcoholic (commercial absolute) Solution of naphtalene, resorcin, 

 «-naphthol, and «-naphthylamine destroy the vitality of airdried 

 grains, but not the desiccated ones. 



The vitahty of the desiccated grains of Orysa (hulled) arrd Zea 

 is lost by twenty-four hours' steeping in formaldehyde, formic acid, 

 commercial absolute methyl alcohol, methyl ether, acetaldehyde, 

 glacial acetic acid, butyric acid, amyl alcohol, pyridine, and the 

 aqueous Solution of chloralhydrate, resorcin hydroquinone and 

 twenty one hours' steeping in nitric acid (3 N, 6 N.). 



Even the embryonal halves of the desiccated hulled grains of 

 Orysa are capable of germination after twenty-four hours steeping 

 in commercial absolute ethyl alcohol, ethyl ether, the ethyl alcoholic 

 (commercial absolute) Solution of resorcin, acetic acid, hydroquinone 

 and naphthalene, but the airdried entire hulled grains are killed 

 by the similar treatments. 



Twenty-four hours steeping in the aqueous Solution of phenol, 

 resorcin, «-naphthol, hydroquinone, acetic acid, and mercuric Chlo- 

 ride is fatal to the desiccated and air-dried grains of Orysa (hulled) 

 and Zea, whereas the corresponding alcoholic (commercial absolute) 

 or ether Solutions are harmful only to a considerable extent. 



The hulled grain of Orysa can be germinated at an extreme 

 low oxygen pressure, but under such condition the development of 

 the radicle is totally prohibited. A supply of oxygen initiates the 

 development of the radicle in the seedUngs thus germinated. 



No appreciable stimulating influence ofH and ÖHionsis observed 

 in the germination of the Orysa grains. 



The germinative power of the grains of Ory^^a, Z^a and the seeds 

 of Fagopyrum is practically unaffected by a few hours exposure to 

 an extreme low temperature by means of steeping them in liquid air. 



By two hours' exposure to 97—98° C, the germinative power 

 of the grains of Zea is lost, but that of the grains oi Orysa, especially 

 if desiccated, is only slightly affected. M. J. Sirks (Wageningen). 



Neresheimer, E. und C. Clodd, Ichthyophomus hoferiPlehnund. 

 Mulsow, der Erreger der Taumelkrankheit der Sal- 

 moniden. (Archiv Protistenkunde. XXXIV. p. 217—248. 3 Taf. 

 u. 15 Textfig. 1914.) 



Sommer 1910 trat in einem Betonbassin in Traunkirchen 

 (O.-Oesterreich) unter den dort gehaltenen Salmoniden eine 

 Fischkrankheit auf: ein der Seitenlinie entlang geführter Schnitt 



