THE PRODUCTS OF THE TISSUE CHANGE. 559 



that seen in the higher plants, can also he observed in 

 the lower fungi. This is minimal in amount if the 

 intramolecular respiration alone is going on, and if 

 there is neither access of oxygen nor the occurrence of 

 fermentation ; under these conditions an elevation of 

 temperature of *2 C. over the surrounding temperature 

 was found in yeast (growing in hydrogen) ; when air 

 was admitted the elevation of temperature increased to 

 1*2 C., and when fermentation occurred, to 3 '9 0.* 

 These numbers, of course, only apply to the particular 

 circumstances under which they were obtained. Eleva- 

 tion of the temperature of the nutrient medium has also 

 been observed in the case of the fission fungi, though 

 chiefly during the fermentative action. t 



Lastly, a development of light sometimes accompanies Development 

 the vital processes of the fungi. In the case of some of of lightt 

 the higher fungi, especially of species of Agaricus, this 

 phenomenon has been known for a long time; quite 

 recently the phosphorescence which putrefying fish or 

 pieces of flesh at times show has been ascribed to lower 

 fungi, especially to micrococci, which, however, only 

 occasion this phenomenon when a free access of oxygen 

 and a temperature not too low, permit an energetic 

 respiration. 



4. The Products of the Tissue Change of ilie Lower 

 Fungi. 



The number of the products of tissue change which Products of 

 are from time to time observed in cultivations of fungi il 

 is extremely great ; gases, such as carbonic acid, hydro- 

 gen, marsh gas, sulphuretted hydrogen, ammonia ; 

 nitrates ; water ; sulphur ; also volatile bodies, such as 

 trimethylamine, alcohol, formic acid, acetic acid, pro- 

 pionic acid, butyric acid ; fixed acids, such as lactic 

 acid, malic acid, succinic acid, oxalic acid, tartaric acid; 

 sulpho- acids, such as taurin, amides of the fatty acids, 

 especially leucine, alanine, &c. ; bodies of the aromatic 



* Eriksson, Unters. b. dem botan. Institut. in Tubingen, 1881, Heft 1. 

 t Popoff, Botan. Jahresb., 1875. Wernich, Organisirte Krankheitsgifte. 



