Notes. 
I 75 
they do give rise to the secondary stomata, they behave in precisely 
the same way as the mother-cells of the primary series, but they 
never, apparently, attain to the same size as the latter, and are thus 
always easily distinguished from them. The epidermal cells which 
border on the new guard-cells frequently divide in such a way as to 
produce a resemblance to subsidiary cells, and this may also occur 
Fig. 6. Fig. 7. Fig. 8. Fig. 9. 
Fig. 11. 
Fig. 12. 
Fig. 13 - 
Fig. 10. 
Fig. 6. Primary stoma in ovary of flower- bud. Figs. 7, 8. Younger stomata in 
same bud. p 
Fig. 9. Newly-formed stoma after withering of the flower. 
Figs. 10-13. Primary stomata dividing in half-ripe fruits. 
round the primary stomata, but in both cases the phenomenon is 
of irregular occurrence. 
Meanwhile, besides mere increase in size, the guard-cells of the 
primary stomata are influenced, though indeed to a partial extent 
only, by the causes which lead to the renewed and active division 
in the rest of the epidermal cells. They also, in many cases, make 
feeble attempts to divide, but they exhibit considerable irregularity, 
both in the extent and in the manner of their division, as the Figures 
5-8 clearly show, and it is very' common to find that even the two 
