GRAZING RANGES IN SOUTHERN ARIZONA. Pra 
It is thus shown that while the growing season began a little earlier 
in 1911 and in 1914, there was sufficient rainfall each summer to pro- 
duce the normal crop. But there is no continuous diminution of the 
precipitation from the first of the period to the last of it. In fact, 
1914 was the rainiest year of the five, though all the plats show the 
least production during that year. 
THE WEIGHT OF ARIZONA RANGE-GRASS HAY IN THE STACK. 
The method used for the measurement of hay in stacks is to com- 
pute the volume of the stack and divide this result by the volume which 
weighs a ton of the given kind of hay. In computing the weight 
of Arizona range-grass in the stack, no data for obtaining this 
volume were available. In 1912, however, an opportunity for a single 
record was offered. That fall the press of other work made it necessary 
for Proctor to stack his hay and bale it later. The hay from 224 
acres was Stacked and measured. In March, 1913, the stack was 
measured again and the hay was baled and weighed. Using the 
FO W CL rule for computing the two volumes of the stack and 
dividing each by the total weight of the hay, it was found that of the 
newly stacked hay 861 cubic feet weighed 1 ton, while only 657 cubic 
feet of the old hay weighed as much. Since the first measurement 
was made when the hay was first stacked, it was assumed that 800 
cubic feet of hay in the stack standing less than 30 days would 
weigh approximately 1 ton, and this factor was used in our com- 
putations. So far as the writer has been able to learn, this is the 
first record of definite measurements for the actual weight of Arizona 
range-grass hay in the stack. 
THE COST OF MAKING RANGE HAY CN THE SANTA RITA RESERVE. 
Only one set of records as to the cost of making range hay on this 
reserve has been obtained. In 1914 an area of 114.2 acres was mown 
which yielded 45.36 tons of hay. The crew required for the work 
was 8 men, a cook, and 6 horses. The machinery equipment 
consisted of 2 mowing machines, one 1-horse rake, one 2-horse 
buck rake, a baler, and 2 wagons, with the necessary harness, water 
barrels, and hand tools. The wages paid the men ranged from 
75 cents to $1.25 per day and board, each man furnishing his own 
bedding. Allowing 25 cents a day per man for food, the total cost 
for food was $35. The grain and provisions came from the farm of 
the operator. The horse work done was as follows: 24 horse-days 
mowing, 12 horse-days raking, 20 horse-days bringing the hay to 
the baler, 20 horse-days baling, and 6 horse-days coming to the 
reserve, besides the necessary trips for water (3 miles and return for 
a load). The work required 12 man-days for the mowing, 12 man- 
