366 BOARD OF AGRICULTURE. [Pub. Doc. 



Formula 2. 



Formalin (40 per cent solution formaldehyde), . 8 fluid ounces. 



Water, . . . . . . . .15 gallons. 



Immerse seed tubers two hours in this solution. 



Formula 10. 

 For disinfection with formaldehyde gas: — 



Potassium permanganate, . . . . . .23 ounces. 



Formalin (40 per cent solution formaldehyde), . . 3 pints. 



The above is sufficient for each 1,000 cubic feet of space. Place 

 the seed tubers in bushel crates or shallow slat-work bins in a tight 

 room; spread the potassium permanganate evenly over the bottom 

 of a large pail or pan in an open spot in the centre of the room ; pour 

 the formalin over this, and give the dish one rapid tilt, to ensure 

 thorough mixing; leave the room at once, and tightly close from 

 without. The bins or crates should be so arranged that the gas can 

 circulate on all sides of them and mix with the air of the room before 

 it comes in contact with the potatoes. To avoid injury from the strong 

 gas as it is liberated, no potatoes should be placed directly above the 

 generator. 



Formulas for Beetles and Slugs. 



Formula 3. 



Paris green, ........ ^ pound. 



Lime (unslaked), ....... 3 pounds. 



Water, ......... 50 gallons, i 



The standard remedy for the destruction of insects which eat the 

 foliage or fruit. The lime is added to prevent the Paris green from 

 burning the foliage. Slack the lime in a little water, and make a thin 

 paste and strain; wet up the Paris green with a little water into a 

 thin paste ; mix the lime and Paris green and add the remainder of ■ 

 the water. 



Formula 4. 

 Lead arsenate or disparene, ...... 2 pounds. 



Water, ......... 50 gallons.' 



Arsenate of lead acts slower as a poison than Paris green, and for that 

 reason is not so effective for killing insects on rapidly growing plants 

 like potatoes. It can be kept suspended in the water better than Paris 

 green. It does not burn the leaves, and sticks to the foliage better than 

 Paris green. Make a smooth, thin paste with the poison and a little 

 water, and add the remainder of the water and stir thoroughly. 



1 An ordinary oil barrel holds about 50 gallons. 



