LIMITS OF ENDURANCE OF DIFFERENT FARM CROPS. 171 
this point germination would certainly be prevented. The 
plants in Nos. 81 and 82 were nearly dead by January 15th 
and in 83 quite dead. 
The germination of maize is therefore not affected by the 
presence of arsenic in the soil up to °4%, at °5% however, 
germination is affected, and is prevented by quantities 
above °87; °057- has an effect upon the growth of the plant 
and *20% produces stunted plants, °6 to °7 being enough to 
prevent their growth. 
These results are tabulated below :— 
Effect wpon germination and subsequent growth of Maize of 
different percentages of injurious substances in the soil. 
ee OE A) Sere eS 
NaCl °20 50 "10 *25 
Na.CO, *20 "D0 "10 °25 
NH.:CNS = :005 above °02 (001 = above ‘02 
NaClO; °004 = =above °006 °001 004 
As.O; "D0 above °80 °05 60 
