1 \)TATO In VESTIGATIONS 
13 
u Ksiligle season. This does not eliminate the possible influence of 
seasonal variations on the original seed stock which may be reflected 
in the following crop. 
The Pearl seed was obtained from three sources and the data 
cover a period of four years. With the exception of one season when 
the dry land seed was badly diseased, stock from this source has 
given the best results, with the Wisconsin seed next in order, the 
yields of both being considerably above those obtained from the 
Colorado irrigated seed. The largest yields of the Rural New Yorker 
Avere obtained from the Wisconsin stock, with yields from the New 
York state seed closely following. A study of the yields of all the 
varieties included in this experiment shows very consistently the 
relatively high quality, as measured by the crops produced, of the 
Colorado dry land and Wisconsin seed. 
LOSSES DURING STORAGE 
These losses, which are shown for the different years in next to 
the last column in tables 1, 2, 3, and 4, respectively, include the 
decrease in weight due to evaporation from the surface of the 
tubers and from respiration, also the weight of dirt which adhered to 
the tubers in digging but which was largely removed during the 
process of sorting. In 1917 severe freezes before all the potatoes 
Fig- 4 — Potato storage house at experiment station. 
