AEROBIC SPORE-BEARING NON-PATHOGENIC BACTERIA 503 



Potato. Growth finely wrinkled, grayish and viscous. The 

 wrinkles appear wave-like. When older the growth loses its 

 viscosity and becomes dry and granular. 



Litmus milk. A gradual clearing from the top due to progres- 

 sive peptonization occurs within 24 hours. Within 48 hours 

 peptonization is generally completed. The remaining fluid has 

 a port-wine color but becomes amber-colored after a variable 

 period. 



Blood serum. Smooth, moist, glistening and viscous growth. 

 Within 24 hours some solution of the medium occurs along the 

 line of inoculation (a trough-like excavation). The medium 

 may be entirely dissolved within 2 weeks, and a tenacious scum 

 may be formed. 



Fermentation tubes. Glucose: finely granular scum is formed 

 which generally breaks up into large flakes. A flocculent growth 

 is present in the bowl. The reaction is definitely acid. 



Saccharose : the growth is the same and the reaction also acid. 



Lactose: the growth is also abundant with more pronounced 

 scum-formation. Reaction alkaline. 



Thermal death point. The spores survive 10 pounds in the 

 autoclave but are destroyed by 15 pounds pressure. They sur- 

 vive 30 minutes steaming in the Arnold but are destroyed by 

 one hours exposure. 



Bacillus adhaerens nov. sp. 



This organism has been encountered but once, in dust. It is 

 apparently a new species. 



Morphology. Slender long rods with homogeneous prot oplasm 

 and flat ends, growing usually in long curved chains made up of 

 18 to 20 elements. In young cultures on plain agar the indi- 

 vidual cells measure 0.375 to 0.5 by 1.5 to 4 microns. Some 

 longer forms, 6 microns in length, may also be found. On glu- 

 cose agar the organisms are homogeneous, measure 0.625 to 0.75 

 by 3 to 5 microns, but are often longer measuring 6 to 8 microns. 

 In older cultures (4 days) many globular bodies occur on glu- 

 cose agar. They resemble the globular bodies seen in Bacillus 

 cereus. (Figures 63 and 64.) 



