BOTANICAL GAZETTE 
TABLE II* 
[NOVEMBER 
RESORCIN BLUE CHANGED CALLOSE TO BLUE 
Acrpity, Px VALUE, BY USE 
oF CLARK AND Luss’ 
INDICATORS 
_ Callose Acidity 
Loam Sand Loam Sand 
ro sey Thick layer, espe-| Thick layer, espe-| 6.0-5.2 6.0-5.2 
Mer ser ially on young cially on young 
hairs hairs 
Beans (Bush lima).| Thick layer Thick layer 5.2 6:075.2 
Beans (Pole lima). .| Thick lay: Thick layer 6.0-5.2 6.0-5.2 
Beans (Golden Fairly thick layer,| Thick layer Roe 6.8-6.0 
WA eco especially on 
young hairs and 
tip 
Cabbage (Chinese).| Thin laye Thin layer 6.8-6.0 6.8 
Cabbage (Early Thin a. found] Same asin loam | Nearer 6.0] Nearer 6.8 
Jersey e- on young root 
held) 9.20523 pecially 
Carrots (Danvers).| At ft only, in Thick in older 6.0-5.2 6.0-5.2 
g hairs hairs 
fie ‘all around| 
Corn haces Rew haghatt , espe- | Same as in loam 4.6-4.4 6.0-5.2 
tai). cs 
=e Thick iw Thin layer 6.0-5.2 | 7.6-6.8 
pres (Early | Thick layer Thick layer 6.0-5.2 6.8-6.0 
Egg plant (Black | Thick layer, espe-| Thick layer 6.0-§.2 6.0-5.2 
; cially at ti 
a (Mignon- On younger hairs | Same as in loam 6.0-5§.2 6.0-5.2 
SE Ee especially 
aren (Hollow Thick layer, espe-| Same as in loam 6.8-6.0 7-6-6.8 
CrOWN) <2 2. cially at ti 
Peas (Telephone). .| Thick la jess layer ? 6.0-5.2 
Radish (Sparkler)... — but el Layer at tip 6.8-6.0 7.6-6.8 
airs 
Squash (Golden Thick $i thick- Thin layer, thick-| 6.0-5.2 6.8-6.0 
Hubbard). ..... er at er at tip 
Squash (Giant Thin si Fairly thick layer| 6.0-5.2 6.8-6.0 
oor crook- 
Swiss Chard _ Frsgtink thick-| Same as in loam 6.0-5.2 6.8-6.0 
(Lucuthis)..._-. 
Tomatoes Thick layer, snc Same as in loam 6.0-5.2 6.0-5.2 
(Ponderosa)... .. cially 
atermelon Thick layer, espe-| Same as in loam 6.0-5.2 6.8-6.0 
(Cole’s early)...| cially on young 
From these experiments it would seem that some of the acidity 
of the soil is due to pectic material in the root hairs, 
and that this 
