346 BOTANICAL GAZETTE _ [NOVEMBER 
TABLE D. 
CHIEF CONSTANTS OF THE SEVERAL COLLECTIONS. 
Bracts | Sep. 12 | Sep. 14 | Sep. 16 sep 18] Sep. 21 leap 23| Sep. 25 |Sep.28] Sep. 30 
iv 2/Oct. 6) Oct. 9 
Mean..... 36.555| 43.207] 43.174|43.898| 40.700) 40.652] 39.828|37.423 36.016|35.120|/33.006| 35.750 
P.E. y....J£1.110]/+ .868)+ .947)+ .500/+ .723/+.4092/+ .508/+.401/4+ .543|/4+.423|+ 3890/4 .035 
Piigew kek 9.870] 7.829) 6.735] 6.951} 8.303] 7.002] 7.000] 6.508) 6.438] 5.717] 5.247] 2.773 
P. Eng.) .785|+ -614/+ .670/+ .353;4 .§11t)+ .348)/+ .423/4+.284/+ . + .200|+ .275|4 .661 
Ceci 27.000] 18.081] 15.600|/15.835| 20.401/17.225| 17.801|17.630| 17.877|16.278|15.854| 7.756 
6) + + x1. 
304 
: 77 
P. E.y....|+2.146]+ 1.418/+ 1.551|+ .805|+1.25 857|/+1.061|+ i 1,066] + .852/+ .830| + 1.849 
Rays 
Mean..... 23.305) 27.540] 26.730/28.681| 26.600/26.033) 26.187/24.170) 24.10045 Seen 24.500 
P.E.m....|£ «720+ .582/+ .660/+ .380/+ .485/+.326)4+ .302/+.240/+ .342|+ .272/+.278|/+ - 
Wavenacs: 6.407} 5.2 4-757| 5.284] 5.571] 4.628 -650| 4.092| 4.058) 3. 3-757) T+ 
P.E.o...j+ .500/+ .412)/+ .473]/+.269/+ .343]/+ .230)+- .277|/4.176/+ .242|/+ .192)+ .107 + 
Ce aia 27.400; 19.158] 17.790/t8.423| 20.045|17.780| 17.750|16.026| 16.834|15.361|16.846 +769 
EE +2 4 404,41 a 037|+1.290] + 884\+1.059|+ 728|/+ 1.004 + 804 + .882 +1.614 
Disk-florets 
Mean.....| 41.611) 51.720) 46.522|51.511| 47.100|46.801| 47.672|43.560| 42.187)41.301 38.072) 40.259 
PEw +1.282\+1 318 +7 pice ba gd os baler -813 +.4590)/+ .682)+. + ee 
Weis: 11.405| 11.884) 9.546|10.062} 9.809] 8.560] 9.647| 7-530] 8.087] 6.339) 7-2 Fogr 4 
P.E.o.../+ .007/+ .032/+ .o4o/+.512\+ .610;/+.426|/+ .575/+.324|/+ .482/+.332 = 354] 8.192 
COMG tes 27.408] 22.073) 20.510|19.534| 21.017|18.274| 20.236/17.303| 19-170|15.349|19- +1.937 
P.E.y....|+2.179| + 1.801| + 2.041|+ .903|+1.204|+ .909|+ 1.206/+ .744]/+1.1 -804| + .993 
ee 
In Table D are given the more important constants of the several 
collections with the probable errors of the determination. The 
since the prob- 
average deviation is omitted as having no significance, ' 
able error of the determination is almost as large as the determined 
value of the constant. It will be noted on examining this table that 
all the constants are quite variable, and that only the mean seems t0 
follow a rather definite law, beginning low, then leaping "we 
immediately to the maximum, after which there is a gradual 
until almost the end, when a slight rise appears. The fall of se 
values from the maximum on September 18 to the aes a 
October 6 was 24.6 per cent. in bracts, 22.25 per cent, 1n pci 
26.4 per cent. in disk-florets. The changes of mean value mee 
set of variants from the beginning to the end of the flowering S° 
and the corresponding changes observed in 1900 are shown a 
in fig. 7. : 
