1922] KNUDSON—ORCHID SEEDS 9 
water. The liquid was filtered and made up to a liter volume by 
the addition of distilled water. 
All cultures were made in quadruplicate. The individual 
cultures of each series were strikingly uniform in growth, so that 
TABLE I 
Laelia-Catileya HYBRID NO. 1;* SEEDS PLANTED veg 31, 1920; MEASUREMENTS 
MADE JANUARY 27, 
Wiwra GICkONS  ._«{PERCENT-|ORDER OF 
CULTURE AGE OF | SUPERI- 
NO. CULTURE SOLUTION GERMINA- 
ORITY, 
|Minimum|Maximum| Average TION Marcn27 
Bee whips Sabnsen 50 cc.+50 Cc. 242 582 407 ° 5 
Bt. Pal nutrient ae cc.+50 cc. 339 630 459 ) & 
potato 
‘B60: > Fall nutrient so - cc.+50 cc. 174 436 291 ° 7 
eat 
B 30 Fuil nutrient-+ 30% iia: 485 | 1261 970 20 4 
B 28 Full nutrient solution alone 194 2 213 ° 8 
B27 Full nutrient+2% glucose 485 | 1358 814 70 3 
cc cc. beet extract 
B 34 Full nutrient +2% glucose 582 1358 979 go I 
ce heat extract 
Bs5 Full nutrient+ glucose g82: | 1552 | 1076 go I 
98 cc. yeast extract 
B 66. Full nutrient+ 2% ctose 776 1260 940 I 
B48. Full nutrient-+-2% fructose 485 | 1358 go2 80 2 
go cce.+10o cc. beet extract 
B 22 ull nutrient ructose 485 | 1202 | 1008 go I 
go cc. oe 8, gree a ct 
B31 nutrient+2% fru 582 1260 go2 70 2 
90 cc.+10 cc cs oir pera 
Bs Full nutrient-+2% fructose 582 1358 1047 80 I 
98 c cc. yeast extract 
B 43 nutrient +2% f 582 | 1746 | 970 | 60 2 
4 cc. yeast extract 
B 14...) Beet extract alone 242 872 388 ° 5 
B 69... Sone cote alone 339 679 504 ° 5 
66.4 We xtract alon 242 436 358 ° 6 
B.. Yeast tae art alone ay: 339 194 ° 7 
* Composition: L. Perrinii Lindl. 3; C. labiata Lind]. }; C. amethystoglossa Reichb. 3; C. inter- 
media Grah. }. 
for the first measurements only one culture for each series was 
taken, and forty individual measurements were made for each 
culture. The measurements given in table I were made on January 
27,1921. ‘The order of superiority of the cultures on March 27 is 
recorded in the last column of the table. Similar data, not 
