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MRS. G. C. FRAN EL AND AND DR. P. F. FRANKLAND 
yellow. (See Plate 17, No. Go.:) The needle-track below the surface exhibits a fine 
saw-like growth, which is more considerable than that of many of the organisms 
described above. 
Agar-agar .—The growth again exhibits a highly serrated edge, but the rate of 
extension over the surface is more rapid than in the case of the gelatine. 
Broth .—After nine days (August 7—16, 1886) the liquid is turbid above, but clear 
below, and is clothed with a thin cloudy-white pellicle on the surface. There is also 
a white deposit at the bottom. 
Appearance on plate-cultivation .—To the naked eye the colonies are circular and 
bluish-white, with a small yellow spot in the centre. On the surface of the gelatine 
they form distinct pin-heads. Under a low power (x 100) the larger surface-colonies 
are seen to be circular, with an irregular corrugated edge, enclosing coarse granular 
matter. The central portion is cloudy and surrounded by a distinct ring. (See 
Plate 17, No. Gel.) 
The smaller colonies in the depth of the gelatine are very irregular in shape and 
resemble the corolla of a flower. The contents of the colony is more finely granular 
than those of the larger surface-colonies, the centre being also clouded. (See Plate 17, 
No. Ge.) 
As in other cases, the cultivations were made by inoculating from both kinds of 
colonies, and the identity of the two proved. 
7. Bacillus Profusus. 
Occurrence .—This was found in the air collected on the roof of the Science Schools, 
South Kensington Museum, producing a beautiful iridescent growth on the surface of 
gelatine. 
Microscopic appearance .—Under a high power it is seen to be a short fat bacillus 
with rounded extremities. The length reaches about l'7p, and the width about '5p. 
As seen in Plate 18, fig. 2, No. 2 a, the dimensions of the bacilli are very variable even 
in one and the same colony (the drawing was made from a preparation taken from a 
colony). These larger forms are comparatively rare; their length is more than 1‘7/x, 
the width even sometimes reaching that figure. 
Viewed in drop-cultivations, they were found to exhibit vibratory motion only, and 
were seen isolated as well as hanging together in short chains of two, three, and four. 
Appearance in Cultivations. 
Gelatine .—There is but little growth in the path of the needle below, but on the 
surface it frequently extends in a very thin layer which has a beautiful opalescent 
appearance when viewed by transmitted light. 
Agar-agar. —On this medium it forms a much thicker growth, giving rise to a 
smooth, whitish, lobular expansion, the thinner foliated margin of which exhibits 
beautiful iridescence by transmitted light. 
