and the lytic vacuoles of acidic pH, which are equivalent in function to lysosomes in mammalian cells (Figure 1). A special feature of guard cells is that they can increase or decrease their ...

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 ...