1887.] 



New Micro-Organisms obtained from Air. 



151 



different varieties of aerial micro-organisms, which have hitherto 

 remained either unknown or nndescribed. They have therefore 

 undertaken the characterisation of a number of these organisms by- 

 growing them in various cultivating media and observing the different 

 appearances which they subsequently exhibit, by studying them 

 microscopically in stained and unstained preparations, and by culti- 

 vating them on gelatine-plates, and describing the colonies to which 

 they give rise. They have likewise made a number of drawings to 

 illustrate the appearances which they present under the various exami- 

 nations to which they have submitted them. To further facilitate 

 their identification the authors have provisionally given them names, 

 by which they have endeavoured to represent some of their most 

 striking individualities. 



The authors venture to hope that by thus characterising some of 

 the organisms most prevalent in the atmosphere, they may prove of 

 assistance in those investigations which have for their object the 

 study of the particular physiological changes which are brought 

 about by specific micro-organisms. 



The following is a list of the micro"- organisms described : — 



Micrococcus carnicolor. 

 ,, albus. 



gigas. 

 ,, chryseus. 



candicans. 

 Streptococcus liquefaciens. 

 Sarcina liquefaciens. 

 Bacillus aurescens siccus. 

 „ aureus. 

 „ citreus. 



Bacillus plicatus. 



„ chlorinus. 



„ polymorphus. 



„ profusus. 



„ pestifer vermicularis. 



„ subtilis minor. 



„ subtilis cereus. 

 Saccharomyces rosaceus. 



„ liquefaciens. 

 Mycelium fuscum. 



In addition to these varieties a description has been given for the 

 .-sake of comparison of some aerial micro-organisms which were 

 obtained by one of the authors from Dr. Koch's laboratory in Berlin. 

 These are — 



Micrococcus rosaceus. 

 Sarcina lutea. 



,, aurantiaca. 



Bacillus subtilis. 



„ (Micrococcus) prodi- 

 giosan. 



