62 The Colorado Experiment Station. 
narrowness of tread recommend them, especially in the heavier 
weights, in preference to horses, for potato growers. 
An Active i^oo-pound Animal the Best .—Horses of not too 
blocky type, weighing from 1,400 to 1,500 pounds, are the choice of 
most experienced growers. Five or six such can break alfalfa any¬ 
where; four such can pull a digger all day, if required; and a pair 
of them can handle three tons of potatoes for the regular load on 
good roads. This is the standard, net load, at Greeley. 
Power Units .—An eighty-acre potato farm should have five 
horses of this size, and a 160-acre farm, eight. It is cheaper to 
have them good, and to have only this number; and it is wise to 
adopt a standard of size, action, color, and harness, and to have 
only such animals and harness, in order that the units of power 
may be interchangeable, and make up into two, three, four, five or 
six-horse teams, of like strength and speed. 
The Manufacturer has long considered such items as these in 
the efficient conduct of his business; farmers have commenced to 
apply the same principles to their business. 
FIELD EXPERIMENTATION 
Variety Trials have been continued by the station since 190 6 and 
before. All promising sorts of this country, Great Britain, and of con¬ 
tinental Europe have been tried. We feel that we know absolutely the 
best sorts for Colorado. This work is therefore finished to date, and will 
be continued only as new sorts arise. It is greatly to the economic benefit 
of the potato industry to have such work done by the state, and the facts 
established by clear cut public experimentation rather than by widespread, 
indefinite and costly private experience. 
Seed Changes and Sources are now pretty well understood. The 
principles involved have been largely fixed, and are formulated in Bulletin 
176, and such work as is carried out in the future along this line will be 
only by way of working out these matters more definitely. 
Some New Terms have been adopted in Bulletins 175 and 176. From 
England we have appropriated the term ware, which we think a more 
useful term than saleables or table stock, both of which it can well re¬ 
place. We have used also the English word maincrop instead of our in¬ 
definite term late varieties as opposed to early varieties. For instance the 
Pearl potato is our leading maincrop sort, but it is not a late potato. 
Among variety names we have attempted to establish the better and more 
appropriate names, always favoring the old as opposed to any new name. 
The Peachblow should not be called McClure; the Cobbler is not properly 
called Eureka; and Russet we believe to be most appropriate for the prom¬ 
ising new sort which has carried the indefinite names White Beauty and 
Russet Burbank. Parts of tubers are more definitely named than here¬ 
tofore, in Bulletin 176. 
Future Field Work should be in the development of varieties and 
strains; in obtaining further knowledge as to the reasons for yield and 
for running out of seed stocks; in carrying along up to date each year 
variety trials that we may always have the best; and in the promotion of 
dry land potato growing for the benefit of the entire potato industry and 
for the general good of dry land agriculture. Funds permitting, a de¬ 
mand for fertilizer trials at Greeley and Carbondale should be heeded 
in 1911 and 1912. 
