40 
Proceedings of Royal Society of Edinlurgh. [dec. 5, 
Grosfils communicated a paper to the Societe d’Encouragemeiit de 
Vervier ; and it has recently been published in the Moniteur Indus- 
trial^ describing a method for preserving butter from the action of 
Bacillus hutyricus hj addition of 0’0002 per cent, of salicyli/ 
acid. Butter so treated will keep for an indefinite time, even ik 
warm countries. 
/ 
(e) A Neio Micro-Organism. j 
A new micro-organism, I have recently found upon putrefytg 
onions kept in a warm, damp, and dark place. The cells are ab^ut 
0*005 to 0*007 mm. long, and about 0*0025 mm. in width, 'jhis 
microbe is capable of forming the zoogloea state. 
Fig. 5. — Bacterium allium (a new micro- 
organism) growing on nutrient agar- 
agar (after Nature, but not the colour). 
Fig. 6. — Bacterium allium mder 
high power), stained with 
gentian violet. The cel are 
colourless. The green clour- 
ing matter (which is insuble 
in water, soluble in alihol) 
resides in the interstitia]sub- 
stance. 
They grow tolerably well in nutrient agar-agar, and prodie a 
bright green pellicle upon the surface of the nourishing me(uni 
(fig. 5). This micro-organism, which causes putrefaction in omns, 
liberates small quantities of sulphuretted hydrogen gas. The 
sulphuretted hydrogen was proved by the black stain (PbS) prodced 
upon paper impregnated with a solution of lead acetate ; andjilso 
the yellow stain (CdS) produced by using cadmium paper (Cdllg). 
This sulphur gas is also produced to a small extent in the nutent 
