CERTAIN GENERA OF THE CLOSTRIDIACEAE 19 



berg and Scl^guin, Henry, jNIcIntosh, Adamson, The Committee, 

 Jablons, Esty. Simonds divided the group into four sub-groups 

 on the basis of the fermentation of inuUn and glycerol. Henry 

 and Esty substantiated this finding. The latter finds his strains 

 divisible into two sub-groups on the basis of the sensitiveness 

 of the spores to heat. The division thus made does not co- 

 incide with those secured by means of sugar fermentation. !Mc- 

 Intosh admits a species which sporulates on ordinary media. 

 The Committee, on which !^fcIntosh later served, do not men- 

 tion such a type. The chemical behavior of Welchillus has most 

 recently been studied by Wolf (1919) and Wolf and Harris 

 (1917, a, b, and c). Agglutinins are extremely difficult to pro- 

 duce with these organisms, and are found to agglutinate only 

 homologous strains. Werner succeeded in agglutinating one 

 non-homologous strain. Robertson (1916 b) failed to im- 

 munize guinea-pigs with bacterial protein. Toxins, according 

 to the work of Bull and Pritchett, are all neutralized by the 

 same antitoxin. Esty immunized guinea-pigs with young whole 

 cultures. 



Genus 11. Stoddardillus nov. gen. 



Clostridioideae of energetic growth habit that liquefy gelatin, 

 but do not produce H2S demonstrable by a lead-acetate-paper 

 test in blood broth. Produce abundant gas but little acid in 

 meat medium. Grow very shyly or not at all in milk. Attack 

 a few sugars, but do not produce much acid. Short chunky 

 Gram-positive rods which do not form spores. Colonies in deep 

 agar large, lenticular and opaque. Not easily distinguished from 

 Welchillus. jVIay invade tissue, causing considerable destruc- 

 tion of muscle but no foul odor. One strain, reported from a 

 case of human gas gangrene. 



Type species S. egens (Bacillus egens Stoddard) as described 

 by Stoddard (1919 a). Splits glucose, laevulose, mannose, mal- 

 tose, dextrin, glycogen, inosite and glycerol. Does not sporulate 

 on six days' incubation in inspissated serum. 



Such organisms as this are probably not nearly so rare as 

 reports would indicate because they do not sporulate and are 



