16 



TRANSPIRATION IN A DESERT PERENNIAL. 



Experiment II. 



Subject, a small leafless plant growing near the subject of experiment I. 

 Area, 35.65 sq. cm. Age, approximately six to ten years. 



Table 2. Transpiration of a leafless seedling {B). Experiment II. 



Date. 



1911. 

 Mar. 7. 

 Mar. 8. 



Mar. 9. 



Time. 



Sh 18 p. m 



6 07 a.m 



6 52 a.m 



7 53 a.m 



8 05 a.m 



11 40 a.m 



12 00 m.. 

 2 10 p.m 



2 50 p.m 



4 50 p.m 



6 20 p.m 



6 20 a.m 



6 55 a.m 



7 55 a.m 



8 05 a.m 

 10 05 a.m 



10 25 a.m 



12 25 p.m 



12 50 p.m 



2 50 p.m 



3 22 p.m 



5 20 p.m 



0.00022 

 .00073 

 .00454 

 .00539 



.00252 ; 



.00025 

 .00143 

 .00412 

 .00474 

 .00485 

 .00199 



Date. 



Mar. 

 Mar. 



7.. 



Mar. 9. 



Time. 



5'' 20"' p.m 



6 10 a.m 



6 55 a.m \ 



8 10 a.m I 



8 35 a.m 



11 45 a.m 



12 25 p.m 



2 15 p.m 



2 45 p.m ] 



4 45 p.m / 



5 15 p.m 



6 30 a.m 



6 45 a.m \ 



8 00 a.m / 



8 30 a.m \ 



10 09 a.m / 



10 20 a.m 



12 20 p.m 



12 45 p.m 



2 45 p.m 



3 10 p.m \ 



5 10 p.m / 



E 



00636 

 .0111 

 .0334 

 .0525 

 .0382 

 .00636 

 .0135 

 .0342 

 .0469 

 .0517 

 .0310 



E 



0.034 

 .065 

 .136 

 .102 

 .066 

 .039 

 .106 

 .120 

 .101 

 .094 

 .064 



Date. 



1911. 

 Mar. 7. 

 Mar. 8. 



Mar. 9. 



Time. 



Dew-point. 



Plant. 



5'' 18ra p.m 



6 07 a.m 



6 52 a.m 



7 53 a.m 



8 05 a.m 



11 40 a.m 



12 00 m.. 

 2 10 p.m 



2 50 p.m 



4 50 p.m 



5 20 p.m 



6 20 a.m 



6 55 a.m 



7 55 a.m 



8 05 a.m 

 10 05 a.m 



10 25 a.m 



12 25 p.m 



12 50 p.m 



2 50 p.m 



3 22 p.m 

 5 20 p.m 



2.5 

 -6.5 



3.5 

 3.0 



4.5 

 16.0 



Atmom- 

 eter. 



6 



-7, 



5 

 -0 



4 

 -3 



2.2 



7.8 



3.5 

 12.0 



6.2 

 14.5 



1.8 

 -2.2 



1.8 

 3.0 



"C. 



2.5 



-1.0 



3.5 

 5.5 



= 5.5 

 14 



6.5 

 -6.5 



5.1 



-0.5 



4 

 -1.0 



2.2 

 3.5 



3 5 

 11.7 



6.2 

 13.8 



1.8 

 -2.0 



1.8 

 3.0 



Air. 



C. 

 2.5 

 3 



3.5 

 4.3 



4.5 

 7.0 



6 5 



5.8 



5.1 

 5.1 



4.0 

 2.5 



2.2 

 3.5 



3 5 

 6.0 



6.2 

 6.0 



1.8 

 1.8 



1.8 

 3.2 



Temperature. 



Plant. 



Atmom- 

 cter. 



o p 



67' 

 48 



52 

 60 



62 

 84 



82 

 90 



84 

 78 



78 

 56 



56 

 71 



72 

 85 



86 

 95 



94 

 96 



92 



78 



o p^ 



67' 

 48 



52 

 '66 



2 70 

 84 



'86 

 90 



84 



78 



78 

 56 



56 



71* 



72 

 84 



86 

 96 



94 

 94 



92 

 79 



Air. 



o p 



67' 

 48 



52 

 60 



62 

 82 



82 

 87 



84 

 76 



78 

 56 



56 

 70 



72 

 84 



86 

 93 



94 

 93 



92 

 76 



Relative humidity. 

 Air. 



Plant. 



p. ct. 



32 



60 

 44 



44 

 46 



25 



7 



22 

 19 



47 

 40 



29 

 36 



20 

 29 



12 



14 



24 



Atmom- 

 eter. 



p. ct. 



49 



60 

 41 



37 

 40 



23 

 8 



22 

 17 



47 

 30* 



29 

 35 



20 



27 



12 

 9 



14 



22 



p. ct. 



67 



60 



48 



44 



29 



25 

 21 



22 

 29 



47 

 29 



29 

 24 



20 

 18 



12 

 13 



14 



25 



'SMO'na.m. 



2 8'' 3o" 



M2'25'"p. m. 



