350 On Certain Bacteria from the Air of New York City. 



Remarks. This seems to correspond with 31. cremoUics of Ziinmeriiiann, except 

 that the cells are larger. Cremoides is said to measure .8 /-/, while the pre- 

 sent species measures 1-1.5//. 



14. Micrococcus creiiioides albus n. sp. 



Occurrence. (1) Twice in the air of the college hallway. (2) Twice in the air 



of the yard near 59th St. 

 Morphology and biology as above (Nos. 12 and 13), but the growth pure white 



on all media. 

 Bemarks. This is a white form of the preceding. 



15. Micrococcus pyogenes aureus (Passet). 



Occurrence. ( 1 ) " Staphylococcus pyogenes aureiis ' " from the college collec- 

 tion. (2) Twice in the air of the yard near 59th St. 



Morphology. Micrococci . 7-1 ,« in diameter, associated in irregular masses. 



Biology. Gelatin quickly liquefied; milk coagulated, forming a hard curd 

 which is slowly dissolved ; niti-ate not or very slightly reduced. Growth 

 on solid media orange, the edges of the growth even. In gelatin plates 

 the colonies sink in cups of liquefaction without any peculiar appearance. 

 Culture (1) was chromogenic on glycerine agar and at 37i° C;the one 

 first obtained from the air was chromogenic at STi" C, but grew nearly 

 white on glj'cerine agar and the third culture grew white in both these 

 cases. Rosolic acid not changed. 



16. Micrococcus pyogenes albus (Passet). 



Occurrence. In the air of the college hallway. 



Morphology and biology as above, but the growth is white, on agar rather trans- 

 lucent. 



Bemarks. Tins is probably to be regarded as not specifically distinct from the 

 preceding. 



17. Micrococcus epiderinidis albus (Welch). 



Occurrence. (1) "Staphylococcus epidermidis albus " from the college collec- 

 tion. (2) " Micrococcus of Freire " from the college collection. (3) In 

 the air on 59th St. 



Morphology and biology as above, but gelatin is very imperfectly liquefied 

 The liquefaction begins in about six days, but proceeds very slowly, and 

 never far; even in old cultures it is only partial. 



Bemarks. In the description of Micrococcus of Freire, Dr. Sternberg states 

 that milk is not coagulated, but this ^vas not the case with the authentic 

 culture possessed by the college. It reacted in all ways as given in the 

 synopsis and as indicated above. 



18. Merisniopedia acidi lactici liqnefaciens (Kreuger). 



Occurrence. (1) " Micrococcus ureae " from Krai's laboratoiy. (2) "Sarcina 



erythromyxa " from KriU's laboratory. 

 Morphology. Micrococci .9-1 .1 /^ in diameter, singly, in twos or in fours. 



