DESCRIPTION OF SPECIES. 



515 



in outline, and liquefy the gela- 

 tine. 



The bacilli inoculated in the 

 depth of gelatine cause liquefaction 

 in the track of the needle. 



On agar they form a pale-brown 

 layer. 



They do not grow on potato. 



They were isolated from the skin. 



Bacillus helvolus (Zimmer- 

 mann). — Rods 1'6 to4'5 /i in length, 

 •5 fi in width ; in pairs, and in 

 chains. 



Colonies are pale yellow. 



The bacilli form a yellow growth 

 on the surface of gelatine, and pro- 

 duce slow liquefaction. 



On agar the growth is yellow. 



They occur in water. 



Bacillus heminecroMophilus 

 {Arloing). — Rods highly polymor- 

 phic, and filaments 1 to 20 /x in 

 length. Slightly motile. 



On the surface of obliquely 

 solidified gelatine they form a 

 yellowish layer. 



On potato the growth is yellowish- 

 white. 



They produce oedema when sub- 

 cutaneously inoculated in the 

 vicinity of wounds. 



They were isolated from a caseous 

 lymphatic gland in a guinea-pig. 



Bacillus hepaticus fortuitus 

 (Sternberg). — Rods resembling 

 Bacillus coli communis. 



The colonies, marked with radia- 

 ting striae, are dark brown in colour. 



The bacilli inoculated in the 

 depth of gelatine produce a very 

 slight growth at the upper part of 

 the track of the needle, and a hemi- 

 spherical mass on the free surface. 



On potato they form a creamy 

 white growth. 



They were isolated from the 

 liver in a fatal case of yellow 

 fever. 



Bacillus Hessii (Guillebeau).— 

 Rods 3 to 5';i in length, 1'2 fi in 

 width,^ cocci-forms and filaments. 



The colonies are filamentous, 

 and liquefy gelatine. 



The bacilli inoculated in the 

 depth of gelatine produce lique- 

 faction, and the liquid jelly is made 

 extremely viscous. 



On potato the growth is brownish. 



They coagulate milk. 



They were isolated from milk. 



Bacillus hyaointhi septicus 

 (Heinz). — Rods 4 to 6 /i in length, 

 1 ^ in width. 



The colonies are transparent and 

 bluish-white. 



The bacilli inoculated in the 

 depth of gelatine produce a fila- 

 ment in the track of the needle 

 and a layer on the surface. 



On potato they produce a slimy, 

 dirty-yellow layer. 



They were isolated from diseased 

 hyacinths. 



, Bacillus hyalinus (Jordan). — 

 Rods 3'6 to 4 /i in length, 15 /i in 

 width, and chains. 



The colonies are surrounded by 

 radiating filaments. 



The bacilli inoculated in the 

 depth of gelatine produce liquefac- 

 tion in the track of the needle, a 

 scum on the surface and a deposit 

 at the bottom. 



On agar they produce a dry, grey 

 growth. 



On potato the growth is greyish- 

 white and tuberculated. 



They coagulate mOk. 



In broth they produce turbidity 

 and a pellicle on the surface ; and 

 they are powerful nitrifying 

 agents. 



They occur in water. 



Bacillus hydrophilus fuscus 

 (Sanarelli). — Rods 1 to 3 ^ in 

 length, and filaments 15 to 20 fi in 

 length. 



They rapidly produce a funnel- 

 shaped area of liquefaction when 

 grown in gelatine, followed by 

 complete liquefaction and the 

 formation ' of a white flocoulent 

 deposit. 



Inoculated in glycerine agar they 

 grow rapidly and produce gas 

 bubbles. On potato they produce 

 a straw-coloured layer which be- 

 comes distinctly yellow and later 

 brown. 



They are pathogenic in cold- 

 blooded animals and in small warm- 

 blooded animals. Guinea-pigs suc- 

 cumb in twelve hours ; the spleen 

 is enlarged and the bacilli are found 

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