The Potato Industry of Colorado. 35 
trolled by air pressure from the air brake system would be prefer- 
2- D1. C • .j. 
Danger Dates. Corn growers and even beet raisers have more 
time to complete their work in the fall than has the potato farmer 
because they are more independent of frost. 
The experience of years has established dates past which it is 
dangerous to leave potatoes in the ground subject to heavy frost 
losses. Waiting for potatoes to ripen is not wise; it is better to 
devise ways to ripen them earlier another season and save what is 
m hand this time. 
At 7,000 to 8,000 feet altitude, October ist is the danger line. 
Prate IX.—The Kersey Ditcher 
At Greeley, the leases used to read Oct. 20th, but growers feel 
ST** be T d0ne sev e r al days sooner, as damage has occurred on 
quite safe L ° Wei " ’ ab ° Ut Julesbur ^ for instance, Oct. 20th is 
Old growers recognize these limits of safety. New ones will 
do well to adopt them. J 
CARING FOR FROSTED POTATOES. 
fb hen to Sort Them .—T he third week after storing is the time 
tThe cost of equipping cars in this way is not^bTth^W^Tnn^bk 
system' of thil sort', » 
To Iway 
SanLisVanerand Pu h e S blo tad W ° Uld 66 PartiCUlarly useful between Z 
