New York AGRICULTURAL EXPERIMENT STATION, 315 
trees were injured or killed in culture solutions to which 
from 2.1 mgm. to 6.9 mgm. of potassium arsenite per liter had 
been added, there is some evidence to show that larger quan- 
tities of arsenic would not be injurious to those plants when 
administered to them as an arsenate; for W. Knop*®* says 
that .05 gm. of potassium arsenate added to one liter quan- 
tities of culture solutions would not hinder the normal growth 
and development of corn plants grown in them from the 10- 
to-15-leaf stage to maturity, nor would it kill Velcox or a 
mold. It hag also been determined by Hitchcock and Carle-: 
ton** that a 1-10 per ct. solution of sodium arsenite would 
not retard the germination of Puccinia coronata spores. 
E. W. Day) found arsenic in herbaceous plants and S. H. 
Collins*® grew both barley and tares in 10-inch pots to some 
of which had Leen added arsenious and to others arsenic acid, 
both at the rate of 11 Ibs. per acre. No injurious effects are 
recorded. “Averaging all the results the soil contained 30 
Ibs. of arsenic per acre, to the depth of eight inches, the grain 
contained 4 oz. per acre and the rest of the plants 114 oz. 
per acre. Some samples of soil, outside the experiment, taken 
to the depth of 8 inches, yielded 50 Ibs. of white arsenic per 
acre. It would seem, therefore, “ that soil may contain large 
amounts of arsenic without any suspicion of the fact; (2) 
barley grown on such goil may also contain large amounts of 
arsenic.” This certainly indicates that comparatively large 
quantities of arsenic in soils may be innocuous to plants. It 
was also shown by A. J. Kunkel®’ that arsenic is present in 
many rocks and waters. Though he failed to find it in animal 
tissues, he thinks it probable that his method is at fault, for 
°8 Ueber die Aufnahme verschiedener Substanzen durch die Pflanze, welche 
nicht zu den niihrstoffen gehéren. Abstracted in Bot, Centbl., 22: 35-36. 
1885. 
4 Germination of rust spores in fungicides. Kans. Agrl. Expt. Sta., Bul. 
38, pp. 8-9. 
® Absorption des Arsens durch Pflanzen. Jahresber. Agr. Chem., 3: 83- 
84. 1862. 
°° The absorption of arsenic by barley. Jour. Soc. Chem. Ind., 21: 221-2. 
1902. 
7 Beitriige zur Frage des sogenannten normalen Arseniks. Ztschr. 
physiol. Chem., 44: 511-20. 1905. 
