8 Synopsis of the Bacteria and Yeast Fungi. 



into yellow. In the spectroscope it shows, among others, a character- 

 istic broad absorption band in the green. 



Palmella mirifica, Rabenhorst, can scarcely be anything different. 

 (See Journal of the Royal Microscopical Society, 1882, p. 655.) 



2. M. luteus, Cohn (I.e., p. 153). 



Bacteridium luteum, Schroter. 



Cells elliptic, somewhat larger than in M. prodigiosus, 

 with highly refractive cell-contents ; forming, on a solid sub- 

 stratum, clear yellow drops, which at first are as large as 

 a poppy-seed, and afterwards as a half-peppercorn ; at last 

 drying up to flat shield-shaped umbilicate discs. On nutrient 

 fluids this species forms a thick yellow skin, which becomes 

 plaited when luxuriantly developed 



On boiled potatoes, etc. 



Colouring matter insoluble in water, unchanged by sulphuric acid 

 and alkalies. 



3. M. aurantiacus, Cohn (I.e., p. 154). 



Bacteridium aurantiaeum, Schroter. 

 Cells oval, about i '5 /* long ; on a solid substratum in 

 orange-coloured drops and spots, which at last coalesce 

 into equal-sized patches. On nutrient solutions it forms a 

 golden-yellow skin. 



On boiled potatoes and eggs. 

 Colouring matter soluble in water. 



4. M. fulvus, Cohn (I.e., p. 181). 



Cells round, about 1*5 p. in diameter; at first forming 

 rusty conical tolerably firm drops of mm. 

 in thickness, which increase and finally pro- 

 duce extended gelatinous masses. (Fig. 2.) 

 On horse-dung. 



5. M. chlorinus, Cohn (I.e., p. 155). 

 Cells round (?), forming yellowish-green or 



