Î34 



s. KÜSANO : TRANSPIRATION OF 



of transpiration was not parallel with the increase of tempera- 

 ture, as is shown by the curve in Fig. 2. My experiment wdth 

 cobalt paper gave the following results for interpretation of 

 this feebler transpiration : — On February 21st some leaves taken 

 from a pot- plant of Thea were unable to redden the paper even 

 after half an hour's exposure to direct sunlight, while at the 

 same time Aucuba, Pittosjjorum, Photlnia, Ligustrum and Daphne 

 odora all gave positive reactions, indicating open stomata. On 

 April 23rd, the same experiment with Thea was repeated 

 without obtaining any positive sign of storaatal transpiration. 

 This limited value of transpiration may be attributed to a loss 

 of function by the stomata, caused by the formation of thyloses 

 (Thyllen) under the guard cells, to which Schwendener^^ first 

 called attention, and of which I myself was able to find evi- 

 dences in the leaves of Thea. The measurement of the epidermis 

 and stomata are given as follows : — 



Names of plants. 



Quercus glauca 



Fatsia japonica 



Photlnia (jlahra 



Illic Iwii Anisatuiib 



Daplüiipliijllum mac7'opodnm, 



Tcrnstrœmia japonica 



Fittosporum Tobira 



Thea japonica 



Eriohoirya japonica 



Thickness of the outer- 

 wall of epidermis. 



On the 



upper side 



of the 



leaves. 



5/^ 



Ö 



8 



6.5 

 8 



10 



14 



10-r).5 



1,3 



On the 



lower side 



of the 



leaves. 



2.5^ 

 2.5 



6.5 



6.5 



6 

 10-5 



9 

 10-4 



Number and dimensions 

 of stomata.2) 



Number 



in 

 in mm. 



557 

 182 

 300 

 218 

 300 

 317 

 337 

 293 

 260 



Leng III. 



22^" 



24 



21 



39 



24 



36 



21 



27 



24 



Breadth 



1) ÖC h wendcnu r, Gcsaiuiiu'ltc Abhundkingeu Bd. I, IS'JS, 



2) From Ikeno, I.e., excei)ling Quonus. 



p. 02. 



