THE CHEMIST AIDS THE GARDENER 
NOTE.—Many of the chemicals listed on this page are poisons of the most dangerous character. Extreme care must be exercised in 
handling them; keep them locked away from children and irresponsible adults; maintain labels intact upon containers; have antidotes available. 
Chemical Control of Turf Weeds 
MEO 181 
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A new organic mercury compound that selects 
certam weed plants in a lawn, especially crab-grass, 
dandelions, and plantains, and Sie them without 
injuring the turf; on the contrary, it promotes 
luxuriant grass. One gallon treats 200 sq. ft. of 
lawn when applied without dilution with a fine 
atomized mist spray. Keep away from flowers or 
shrubs. Gal. $1.55, 5 gals. $7.25. 
CALCIUM ARSENATE. Destroys mat-forming 
weeds. Use as a dust. Lb. 40 cts., 4 Ibs. $1.35, 
24 Ibs. $5.50, 100 Ibs. $16.50. 
CHICKWEED ELIMINATOR, PURFECK. For 
a description of this, see page 139. Qt. 75 cts., 
gal. $2, 5 gals. $9, 10 gals. $17, 50 gals. $60. 
CLIMAX LAWN SAND. Kills weeds which have 
fibrous roots. May be scattered at the rate of 6 
ounces per 10 square feet, or, for individual weeds, 
a spoonful placed on the crown of each will 
destroy it. The surrounding grass quickly closes 
over. 314-Ib. can 85 cts., 7 Ibs. $1.65, 14 Ibs. 
$2.75, 28 Ibs. $4.50, 56 Ibs. $8. 
IRON SULPHATE. Controls dandelions, plan- 
tains, and other weeds in acreage turf. Dissolve 
275 pounds in 150 gallons of water and spray 
one acre. Repeat every two weeks till the weeds 
disappear. 5 Ibs. $1.25, 25 Ibs. $4, 100 Ibs. $12. 
LEAD ARSENATE. Used as a dust, this poison 
has also been found to be highly effective in 
eliminating chickweed and mouse-ear. Allow 
10 pounds to 30 pounds per 1000 square feet, 
350 pounds to 1000 pounds per acre. 4 Ibs. $1.35, 
24 Ibs. $5.50, 100 Ibs. $16.50. 
SENOLED. A mixture of mineral colloids and 
Lead Arsenate. Less danger to birds and domes- 
tic animals. Discourages crab-grass in turf and 
reduces Poa annua. Use 25 pounds per 1000 
square feet, or one-half ton per acre. 5 Ibs. $1.50, 
25 Ibs. $3, 100 Ibs. $8, 500 Ibs. $35, ton $125. 
SODIUM ARSENITE. Most effective on plan- 
tains, dandelions and chickweed, knotweed, 
speedwell and self-heal. Applications of from 2 
to 8 ounces to 1000 square feet have been effective 
without injury to the grass—the higher amount 
only during cool weather. May be dissolved in 
water, 1 ounce to 2 gallons or mixed 1 ounce to 
25 pounds of sand and appled dry. 15-Ib. tin 
$3.75, 50-Ib. drum $10.50, 100-Ib. drum $20. 
SODIUM CHLORATE. For crab-grass. From 
Ypound to 2 pounds per 1000 square feet are 
given in May, June, and August, mixed with 
two pailfuls of dry soil or sand. Highly dangerous, 
because the chemical is explostve and inflam- 
mable and is likely to ignite one’s clothing. 100 
Ibs. (minimum quantity available) $17.50. 
SULPHURIC ACID. A wooden skewer, alter- 
nately moistened with the acid in an earthen- 
ware jar and speared into a weed will kill dande- 
lions, plantains, docks, thistles, etc. A danger- 
ously poisonous liquid which will burn flesh and 
clothing. Bottle, containing 9 fluid pounds, $5.75. 
Calcium Chloride 
For binding roadways 
Absorbs moisture from the air; keeps surface 
damp during dry weather; reduces sun-glare; avoids 
surface cracks. Used on paths, driveways, tennis 
courts, playing-fields. Keeps down weeds. Use one 
pound per 10 square feet; repeat at half rate when 
surface becomes dry. 100 Ibs. $3, 400-Ib. drum $10. 



Destroying Weeds in Driveways 
NOXWEED. Poisonous but highly effective. Dis- 
solve and sprinkle. For weeds in tennis-courts, 
etc. Apply with a watering-can, sprayer or 
sprinkler barrel. One gallon dilutes to 41 gallons 
and treats 1000 square feet. Qt. 65 cts., gal. $1.75, 
5 gals. $6, 10 gals. $11.50, 30 gals. $25, 55 gals. $40. 
ATLACIDE. Non-poisonous. Can be used as a 
dust or liquid. Kills poison ivy and other vege- 
tation in driveways, etc. 5 Ibs. $1.50, 15 Ibs. 
$3.50, 50 Ibs. $7, 100 Ibs. $13.50. 
SALT, AGRICULTURAL. Effective as a weed- 
killer on roadways, etc. 100 Ibs. $2.75, 500 Ibs. 
$12, ton $32.50. 
Algae in Swimming Pools 
COPPER SULPHATE. Use 1 pound for each one 
million gallons’ capacity, and make a suitable 
allowance if the water is flowing. Pack in canvas 
bags and drag along the bottom until dissolved, 
or float bags at the intake. 5 Ibs. 85 cts., 10 Ibs. 
$1.50, 25 Ibs. $3.50, 100 Ibs. $12. 
It Doubles the Chromosomes 
COLCHICINE. Influences cell-development, 
affecting heredity, resulting in giantism and 
other malformations in plants, mutations, etc. 
Experimentally, weak solutions are sprayed 
on plants, seeds soaked in them, or they may 
be added to culture solutions. Has wonderful 
possibilities for hybridists, and experimenters 
are advised to acquaint themselves with 
microscopic botany and genetics, and to 
exercise extreme care with this chemical, 
which is highly poisonous and which may have 
effects on the human body. Use gloves and 
do not inhale when using it as a spray. 5 
grains $1, 15 grains $2.25, loz. $5, oz. $32. 
NOT TREATED 
HORMODIN ‘‘B’”? POWDER. In three strengths 
to simplify the rooting of cuttings. Easy to use; 
simply dip the cuttings first in water and then 
dip the moistened stem into the Hormodin 
Powder. Tap gently to remove the excess powder. 
No. 1 (for most house and greenhouse plants such 
as carnations, chrysanthemums, roses, poin- 
settia, etc.). 134-oz. jar 50 cts., Ib. $3. 
No. 2 (for shrub cuttings). 134-oz. jar 75 cts., 
Ib. $4.50. 
No. 3 (for cuttings of evergreens and hardwood 
trees, and also bulbs). 1-oz. jar $1, 4Ib. $4.50. 
Combination package of Hormodin Powders 
No. 1, No. 2, and No. 3, 1 oz. complete in an 
envelope, 75 cts. 
Floralife 
Cut-flowers last long 
and stay fresh with Flora- 
life. With the addition of 
10 ounces of sugar, each 
package makes 10 quarts 
of solution. Pkg. 35 cts., 
10 pkts. $3.50. 

Many chemicals on these pages are poison- 
ous; keep them locked away from children and 
irresponsible adults; maintain labels intact 
upon containers; have antidotes available. 




ame 
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TRADE MARK 
“% 
To FAC 
VITAMENE. Vitamin B-1. A sensation in horti- 
culture. Results m more rapid growth, huskier 
and faster-growing seedlings, healthier and larger 
plants and blooms. Germinates seeds much 
earlier. Cures ill and scrawny plants. Eliminates 
root-shock in transplanting—simply dip roots in 
diluted solution and replant. For indoor plants 
use once weekly; for outdoor plants twice 
monthly. 
Vitamene comes in grooved tablet form for 
easy separation and use. Make a stock solution 
of 4% tablet to a half glass of water, put it in a 
bottle and store away. When you are ready to 
use same on your plants, take one teaspoonful of 
the Vitamene stock solution, dilute with five 
glasses of water, and water as usual. Bottle of 
50 tablets $1, 150 tablets $2.50, 350 tablets $5. 
Kem 

A Complete 
Balanced Liquid Plant- 
Food for House Plants 

Without KEM —and with KEM 
These two geraniums are exactly the same age, 
grown under exactly the same conditions. Results 
shown in the photo are in no way exceptional. 
Similar resuJts are being obtained by Kem users 
everywhere. 
A complete plant-food Consists of eleven major 
and minor chemicals essential to balanced growth. 
Quick and easy to use; merely dilute with tap water. 
Being a liquid it is immediately absorbed by the 
plant. Use 1 tablespoonful to 2 quarts water, 
8 tablespoonfuls to 3 gallons water. One gallon 
makes 90 gallons of balanced plant-food solution. 
Feed to your potted plants; also use for cut-flowers 
and note the startling results. Qt. 60 cts.; gal. 
$1.25, 5 gals. $4.50. 
Plantet 
For Soilless Culture 
A complete mixture of chemical salts; contains all 
elements for the growth of plants by the sand- or 
water-culture methods. For full-grown plants use 
at the rate of one teaspoonful to one gallon of 
water; for seedlings, one teaspoonful to three gallons 
of water. Bottle, sufficient to make 30 gals, 
solution, 75 cts. 
SOILLESS GROWTH OF PLANTS. Nutrient 
solutions and methods of using them, by C. Ellis 
and M. W. Swaney. Just published. 150 pages, 
illustrated with diagrams and photographs (some 
m color), $2.75. 

NEW YORK CITY 
We deliver these materials within 50 miles of New York; purchaser 
pays transportation to points beyond. Prices are subject to change. 
Chemicals 133 
