e 
14 The Botanical Gazette. [January, 
was blown. In this culture bulb was placed some coarse ste 
ilized quartz sand. The longer open arm was closed wi 
cotton. The vessel was filled with culture fluid so that th 
bulb anda portion of the open arm was entirely filled. 
apparatus was connected with the motor and so arranged that 
it revolved in as nearly a horizontal position as possible. Th 
coarse sand inside acted as a distributor of the motion to the 
the small opening of the open arm. Cultures of Monilia can-— 
dida grown for forty hours and treated in this way had 1.4 ~ 
times as many cells as those grown in undisturbed flasks. 
It is practically impossible to get a considerable moveme 
tion of any one factor alone. More intimate divisiqn 
nutritive materials and the constant presentation of fresh fo 
material to the surface of the plant cell probably aids in 
increased growth. 
Summing up the points discussed into concluding sentenc 
we may say that: 
4. The cause of this more rapid cell-multiplication by 
chanical movement seems to depend upon aeration of 
f 
