1918] LOEB—CORRELATION 155 
leaves are always designated as 1 and 2. It is found that each of 
two sister leaves which were of equal size produced almost identical 
masses of shoots in the same period of time and under equal con- 
ditions, although the number of shoots by two sister leaves differed. 
Table II gives another experiment of the same kind. The two 
sister leaves produce in each case almost identical masses of shoots 
TABLE II 
MARCH 29—APRIL 20, 1917 
| ia chants 
Sister leaves — of eee al pati bes oT produced Pet 
I (reat 2 Oe ihe 7 0.2560 2.3030 | Tit 
MUERTOS ee: 9 0.2455 2. 2sce°"! 165 
ll (Tet Bei ee pen ees § 0.1920 1.783 108 
CAE Sol es 4 0.2075 1.09735 [421 
TRAE So 5 0.2005 2.262 89 
TH. cS eae eee 3 0.1605 1.982 81 
IV eat Soe chiiss bats 5 0.1910 1.668 114 
MAME Be Si ees 4 0.1570 1.402 112 
V pee es a 4 0.3205 a.g195 | 128 
Bt en ee ae 7 0.3760 2.0770 | 122 
VL* Teas Fee cave 3 ©.1790 2.191 82 etiolized 
Oe 8 ce. “¢ 0.0595 1.597 caves 
Le Pee Sen p anys 6 0.2355 2.6405 890 
Vi. ‘Tent Be yi Gas: 4 0.216 2.288 04 
VIL. yee : Sd eee 2 ©. 109 1.326 82 
A EN as Ae rata 4 0.132 1.505 88 
eel tin... 3 0.172 1.927 89 
1% yer See 5 0.187 2.093 89 
SOOTOR Eo ie ooo ee 1.675 16.430 102 
Average bephng Re ener Ae as ae 1.682 16.476 102 
* Pair VI is not included in the average. 
in the same time, although the number of shoots varies quite 
often. The shoots produced by the two leaves of the sixth pair 
differ considerably, but those two leaves were etiolized. They 
were excluded from the calculation of the average shoot production, 
which is exactly the same for each set of leaves, namely 102 mgm. 
of shoots for 1 gm. of leaf. 
