278 PLANT PROPAGATION 



side, should fit snugly upon strips of live rubber one inch 

 wide and one-fourth of an inch thick and provided with a 

 hasp for padlocking when closed. 



In one of the front corners a metal tu]:)e two to three 

 inches in diameter and 18 inches long should be fastened, 

 so it cannot shift its position and so its upper end will be, 

 say one-quarter or one-half inch below the lid when 

 closed. Through this the charge of cyanide is to be 

 dropped in the glass or crockery vessel containing the 

 acid and water placed just before the box is closed and 

 locked. To do this a short glass tube containing the 

 charge and closed at one end with paper or muslin tied 

 over it is lowered by means of a string through a hole 

 in the lid and the metal pipe already mentioned. When 

 it reaches the liquid the hole in the cover is plugged tight 

 with (preferably) a rubber cork. To prevent loss, this 

 plug should be fastened with a string to the lid. 



On both bottom and sides of the box, cleats one-half or 

 three-fourths of an inch thick, four to six inches long and, 

 say, six inches apart, should be placed "broken jointed," 

 with spaces of one to two inches between their ends, so 

 the cuttings will be separated a little from the box walls, 

 and so the gas will have free circulation around the sides, 

 top and bottom. The cions should be laid in loosely — 

 never packed snugly. One or two racks made of the 

 cleat stuiif may be placed between layers of cuttings 

 when the box must be filled very full. 



All cions must be dry before being placed in the box, 

 otherwise they may be damaged. Forty-five minutes is 

 long enough to do the work. Then the lid may be lifted, 

 the cions allowed to air for, say, 30 minutes (less if a 

 strong breeze is blowing), and finally washed in water. 

 Avoid inhaling the gas; it is deadly. 



375. Greenhouse fumigation experiments have been 

 conducted in rose and carnation houses at the New Jersey 

 station with 98 per cent potassium cyanide at the rate of 

 five-eighths ounce to 1,000 cubic feet. The tempera- 



