OF SAP IN PLANTS. 35 



March 8. Up to 4 o'clock at A, 9* cub. in. ; at B, 7 cub. in. 



. . 5* .... 7 4 



9. ..7* .... 391 8* .. 



. . . . 2* .... 23| ? 



. . . . 5* .... 9 6 



- 10. . . 7* .... 5f- If . . 



-. -. 2 .... 18* 15* .. 



. . . . 5 .... 7 .... 121 .. 



11. .. 7 .... 13* 4* .. 



.- 2* .... 9* If V. 



- .. .- 5* .... 3* 6* .. 



12. .. 7* .... 5| 7* .. 



. . . . 2 .... 19f 38 



As there was no fixed result here, the holes A and B were 

 bored out again to remove any accidental obstruction. 



March 12. Up to 5 o'clock at A, 5 cub. in. ; at B, 9 cub. in. 



13. .. 7i .... 9J 31* .. 



. . . . 2 .... 4f 33 . . 



.. 5* .... 2 12 .. 



14. . 7| .... 6* 39*.. 



. . . . 2 3 39*.. 



A was closed up, and a new hole C bored near it. 



March 14. Up to 5* o'clock, from C, 5 cub. in. ; fromB, l^cub. in. 



15. .. 7* | .. none. 



..11 3 . . 4 drops. 



Thus, from the 8th to the llth of March more flowed from 

 below; from that time the proportion was reversed, perhaps 

 in consequence of the more powerful swelling of the lower 

 (wetter) wood at A, and a contraction of the orifice resulting 

 from this. After a new hole was bored, the proportion was as 

 in ordinary cases (compare Experiments 20 and 21). 



The specific gravities of the fluids from A, B, and C, exhi- 

 bited the following scale : 



March 8. Spec. grav. of A, 25*705 gramm. ; of B, 25715 



9 25-690 .... 



10. .. 25-712 



11 25-728 .... 



12 25-722 .... 



13. .. 25-718 25717 



14. .. 25-714 25-719 



15. Spec. grav. of C, 25*732 .... 



3* 



