i6 
Colorado Experiment Station 
GOOD PEARL SEED POTATOES: TEN RULES. 
Founded upon the foregoing or explained thereby. 
PEARL SEED IS BEST TO BE: 
From a field free from bloom and the ragged appearance pro¬ 
duced by the presence of many vines of types Nos. 3 and 4 
2. Of true Pearl shape without yoke points or deep eye pits, and 
with the fewest possible knots and compound eyes. 
3. From dry land sod or high altitude irrigated sage brush lands 
with plenty of slope. 
4. Brought from less to more fertile lands—not the reverse. 
5. Exchanged between farms of the same region, rather than kept 
on the same farm. 
6. Not from land where, if soil diseases are a factor, the crop was 
grown after potatoes. 
7. From fields watered early, where slope and temperature allow 
this to be done without causing disease. 
8 ' If f [i° m j b ° V , e the ditch ’ from summ er fallowed lands planted 
rather deeply. 1 
9. From fields which produced a good yield of medium size, 
tubers and did not run too large, because in the latter cas- 
e tubers ot seed size are apt to come from the weaker hills 
10. From special seed patches planted close, and perhaps dug early. 
CHANGE OF PLACE OR SOIL is not the whole problem. 
THE TYPE OF THE TUBER does not answer all our questions 
AT LEAST THREE YEARS HISTORY of the stock is necessary 
