TENOPYR: CONSTANCY OF CELL SHAPE 67 
The results of the cell measurements made are given in TABLE 
IV, which shows both the number of cells per millimeter and the 
dimensions of the cell. The ratio te the length to the width of these 
TABLE IV 
LOBELIA ERINUS 
Comparative length and width of the three types of leaves and the corresponding 
dimensions of the lower epidermal cells of each type : leaf. Numerals in parentheses 
show the number of counts. Line of measurement = 
Linear leaves 
Basal leaves Transitional | 
} | leaves 
"Length | Width | Length| Width Length | Width 
COT AT Oe Se eV eae ee : 27. | 19. 9. 10.5 a5 
Average cell size (15).............-.} 0.066] 0.053] 0.044) 0.048) 0.032) 0.033 
Average number of cells (15)........-. 14.99 18.73 | 22.8 | 20.79 |30.9 | 30.11 
Lea eRe Ss. . | at, &. 1%. 2. 
oe cell size (15) veneees| 0.06 | 0.058 0.052] 0.043) 0.057) 0.04 
Average number of Celis. (15). gers, aren 0 | 16.53 | 16.95 | 19.02 | 23.2 | 17.45 | 24.46 
peg 8 ea eee | 34. St. t5. 9. ta: 3-5 
Average cell ize (19) oe Se ei 0.063! 0.057 0.04 | 0.042) 0.045) 0.041 
Average number of cells (15)......--. 15.76 | 17.45 | 24.63 #8 27 | 22.02 | 24.16 
TRALEE ea ee eee 33: 30. 18. a 2.5 
Averave céll size (5)... 5. as. 2 ee 0.094 0.068 | 0.054} 0. ae 0.042) 0.045 
Average number of cells (5).........- 10:6 |15.48 | 18.18 | 21.33 | 23.49 | 22.17 
Dal eae i eae ees oe 33. 29. 16. 5.5: 134: a 
Avetaee Gert size (0) 0. oe os ee 0.067) 0.074 0.036) 0.035) 0.047) 0.033 
Average number of cells (9). .-...---- 14.83 |13.37 | 27-42 | 28.07 | 21.27 | 29.98 
Deel Boo Co igo ices ob es Ci 30. a5: 20. 7. 20. ne 
‘Average Gell siz6(Q) 0a cee 0.085! 0.062) 0.046) 0.045) 0.051 0.046 
Average a heuer of cells (9) 2024. s. 11.68 | 15.91 | 21.37 | 21-8 | 19.29 | 21.47 
PGE ss ce Pees 5 ees 0. 31. 22. 10. 15. 3.5 
— eel sige (12) 6. oa eae ee 0.06 | 0.079; 0.042} 0.038 0.04 0.033 
Average number of cells (12).......-. 16.49 | 12.56 | 23-45 | 25-77 - 54 | 29.64 
Feat yo 8 eh ig es ee es ee Va aay £5. 8. ce 
pki td pel bine (PL) oe ee. cies are 0.056} 0.06 | 0.036) 0.039 0. ee 0.031 
Ave number of cells (11). .-...... 17.84 |16.57 | 27.03 | 25-57 | 23-92 | 31-55 
Le we * re ea Pe ou ee cae Cae any Al. 37: ans" ye 19. 5.5 
Average ne. Fat) Cores Cee rae 0.064; 0.062) 0.043] 0.04 | 0.054 0.0 
erage hes of cells ie) ey ete 15.48 |15.96 | 23-16 | 24.85 | 18.44 | he 08 
Average measurements of leaves...... a ee 29. 18.88 | 7.94 | 14.25 | 
Ave Ps a measur adie _ cl Oy 0.065} 0.062) 0.043) 0.042) 0. 044 >: 037 
Average number of cells (100).....--- 15.15 ' 15.06 | 22.84 | 23.54 | 22.47 | 26.31 
Ratio dimensions of leaf.........---- 2 2% ie a75 -% 
Ratio dimensions of cell ee i ing ew Ray I.05: TOG ck (F372 F 
cells by no means agrees with that of the corresponding dimensions 
of the leaves. While the difference between the length and the 
width of the linear leaves is almost four times greater than that of 
the basal leaves, the cells of the linear leaves are relatively only .11 
