WHITE BEER, LAMBIC, GINGER-BEER 197 



becoming detached, but only so far as to constitute an independent outer case or 

 sheath enveloping the cells. This jacket either surrounds the cell along its 



FIG. 53. Bacterium vermiforme. 



a-h. The gradual evolution of the cells and chains into the worm form. 



i-m. Development of a sheath increasing oil the one side ; the cell-membrane 

 thickens in certain directions only, and not equally all round. Magn. 680. 



x-z. Dissolution of such unilaterally thickened cell-membranes into branched 

 forms, the cells being visible at the extremities of thj branches. Culture in 

 ginger-beer nutrient gelatin ; x, observed at 10 A.M. ; y, the same at 4 P.M., and 

 2, at 10 A.M. the following day. T..e parts indicated by x, xx, xxx, correspond. 

 Magu. 420. (After Ward.) 



entire length or else only along one side thereof, and is in some cases absent 

 altogether. The breadth of the cell itself measures about 0.5 /*, and the length 



