Nutrition. 



6 grams calcium nitrate. 



1.5 grams potassium nitrate. 



1.5 grams magnesium sulphate. 



1.5 grams neutral potassium phosphate. 



1.5 grams sodium chloride. 



600 cc. distilled water. 



Shake thoroughly, and keep in a tightly stoppered bottle. 

 Wash out the culture jars with water to which a little nitric 

 acid has been added, then rinse with distilled water. Fill the 

 jars to within i or 2 centimeters of the top by adding i 

 part of the original 

 solution to 10 parts 

 of distilled water. 

 Put a small bit of 

 iron chloride in the 

 solution in the cul- 

 ture jars. Place the 

 seedling in the cen- 

 ter of the cover, 

 with its roots de- 

 pending in the water, 

 and wedge in posi- 

 tion with asbestos 

 fiber or cotton, tak- 

 ing care that the 

 packing should be 

 kept dry. Provide 

 a wooden rod for a 

 support when the 

 plant shall have at- 

 tained a height of a 



few Centimeters. Fig. 58. Apparatus for water culture. K, cork 



Set in a room with st PP er divided and furnished with apertures for 



' ventilation when in place ; a, cotton or asbestos 



SUnllght and the W00 1. After Hansen. 



