116* 



loss of the weight of the second cylinder, that is the amount of evapora- 

 tion from the water surface, is subtracted from the loss of the weight of 

 first cylinder. The difference is the amount of transpiration from the 

 surface of the plant-body, main part being from the leaf. 

 Following (able shows the results of the observation. 



No. I. Area of the leaf =14 dm 2 . 



Date. 



Time. 



Cylinder j Cylinder j Water transpirat- 

 with -with ed from the 



plant, water only.: plant in gr. 



Temp. 



Aug. 15 

 16 



4. p.m. 

 8. a.m. 

 4. p.m. 



3373 

 3331 

 3139 



B454gr. | }nighl30 . 



3384 I; |}&J 134 



Jan 34 \^y i meai1 "" 



' 1 ''- 4 ; 28.7 Jmin. 23.4 



hours.) 



G.p.m. 3417 



G.a.m. 3410 



12. in. | 3352 



6. p.m. : 2248 



3545 „ 



3542 „ 



3525 ,, 



3483 „ 



/night 

 Va.m, 41) dt 

 }p.m. 62) 



10: 



nighty 

 25.0 / max. 



day 

 30.5 



2.3 



mean 28.8 

 uiiu. 24 8 



Pelat. 



Humid. 



| ht )max. loo 



ay ( mean s « 

 78 J min. 63 



night 



95 



day 



night. 93/ max. 99 



day 7o>mean 82 



I min. 00 

 Git 



I a.m. 11 



/p.m. 6- 



No. II. Area of the leaf =37 dm 2 . 



Aug. 1U 

 20 



6. p.m. 

 6. a.m. 

 6. p.m. 



31U8 gr, 

 3149 „ 



2845 ' 



3251 



I 

 gr. 



3237 





3175 



>> 



Xnight 35 

 }day 



night 



oo \ i ">S"t i max. 31.1 



240 1 277 !<£" H™ "* 

 I 99.5 /min. 24.4 



night i max. 94 



day [ raeft » 80 

 76 J min. 06 



In No. I the leaf began to fade from the margin at the noon of 

 the seconded day, so the amount of transpiration is less in the second day 

 than that of the first clay, in spite of the less humidity and higher 

 temperature in the second day. In No. II leaf the withering was 

 observed in the noon of 20th, so that the amount of transpiration in that 

 day noted above is less than the healthy leaf can transpire. 



Calculating above given amounts of transpiration to pro. 1 dm 2 , of 

 the leaf-surface we have : — 



No I. 



iday P.57 gr. 



list day|night-> 2.14 „ 



(total-(24 hours)., 11.71 „ 



[day 7.34 „ 



2nd dayJnight 0.2!) „ 



(totai-(24 hours) 7,63 „ 



\) The water is addud. 



2) Few hours of the day-time is included. 



