334 BOTANICAL GAZETTE | [may 
XIII. MEASUREMENTS AND OBSERVATIONS. 
Many hundreds of sections were obtained and are still pre- 
served. From the measurements made from them representa- 
tive tables have been selected and are given below. These tables, 
together with the notes which follow, were made with a view to 
determine the changes in form and size of the cells of the con- 
vex and concave sides. In tissues of this character it is diffi- 
cult to make any comparative measurements of the relative 
thickness of the walls. The figures represent divisions of the 
eyepiece micrometer and have an actual value of .002857™. 
TABLE I. 
Median longitudinal section of root excited geotropically for three hours 
and curved through an angle of 60°. The quantities are given in the nearest 
integer. 
MEASUREMENTS OF LENGTH OF CELLS OF CONVEX SIDE. 
Apical Basal Average 
(Ep) 35 30 20 50 40 42 20 43 35- 
(2) 27 54 56 70 95 53 45 cn Soha 
(3) 54 90... 38 50 30 60 ate és 42. 
Te 43 48 53 76 54 60 eee. 
(5) 35 35 40 40 30 38 50 300 37 
(6) 33 33 34 95 35 30 60 ee 
(7) 39 25 30 30 28 32 36 54 33- 
(8) 40 40 40 33 35 35 25 = ar: 
Average length of cells, - - + - - - 43-3 
MEASUREMENTS OF LENGTH OF CELLS OF CONCAVE SIDE. 
Basal Average 
35 15 28 20 22. 
ea ge ee 
Apical 
(Ep) 15 i. 30 20 
es ae > Syne 7 27 
4 ee: ae ee ae SS sie 
40 
40 
On see ae ee ee 
