I HAVE just read W. Stempel's paper, “Ueber die Funktion der pulsierenden Vacuole,” to which Prof. Bayliss kindly directed my attention in NATURE of November 18, p. 376. Stempel's idea as to ...

How then does the tonoplast increase its surface area so that the vacuole can quickly expand (Figure 2)? Scientists still know very little about this dynamic process, and they are actively ...