PKOTEUS MIRABILIS. 



283 



forms, large spherical or pear-shaped or spermatozoa- More frequent 



like structures 3'75 to 7 /*. in diameter. Further, the foSS*** 



liquefaction of the gelatine occurs much more slowly 



than in Proteus vulgaris. After 12 hours a roundish, Cultivations. 



whitish deposit 2 to 3 mm. in diameter has formed on 



the jelly plates, and under a low power this presents a 



finely granular brownish appearance, diminishing in 



thickness towards the periphery in a stair-like manner, 



and showing an irregular or wavy outline. As in the 



case of Proteus vulgaris, projections pass out from the 



Fig. 107A. Proteus mirabilis (Hauser), swarming 

 islands, X 285. 



border, and these gradually become detached and move 

 away ; but in this case the movements are on the whole 

 less active, and the network which is formed at the 

 surface is characterised by the presence of threads of 

 enormous length. In the moving islands we find the 

 most marked involution forms. In the depth of the 

 gelatine well-developed convoluted zooglaea masses 

 appear ; the appearances thus produced [recall those 

 found by Klebs in the organism which he looked on as 

 the contagium of syphilis, and which he termed heli- 



