430 QUEENSLAND AGRICULTURAL JOURNAL. [1 Ocr., 1901. 
3. The area of a plot is 25,652 square links, and the yield 765 lb. of wheat. 
Find the yield in bushels per acre ? 
A 1,666°6 49°6 bushels 
B 25,652 765 
4, With a drill 8 feet wide, and the length of the plot 756 feet, find the 
bushel per acre of barley from a yield of 124 Ib. per plot? 
A 108°9 179 bushels per acre 
B 756 124: 
5. With a drill 8 feet wide, and the length of the plot 820 links, the yield 
per plot is 175 lb. of oats. Find the yield in bushels per acre. 
A 206°25 44 bushels per acre 
B 820 175 
6. From a plot 5,385 links long, and a drill width (8 feet) wide, the yield 
is 150 lb. wheat. Find bushels per acre ? 
A 13°75 38°25 bushels per acre 
B 5885 150 
This useful instrument may also be found of assistance to butter factory 
managers in compiling the number of lb. weight of butter contained in milk. 
Example.—1,000 lb. of milk tests 40 per cent butter fat. How many 
lb. of butter are there ? 
4-0 test gives 22°52 1b. milk to make 11b. butter.—‘‘ Modern Dairying in 
Victoria.” 
Set 22°52 B to 1,000 A above 1 B, find 444 answer. 
A 1,000 4.404 
B pyri) I 
Rule for Slide-Rule Numeration. 
If the first term is taken on the B line, the answer will be on the A line, 
and use only one section of the B line. If the first term is taken on the A line, 
the answer will be on the same section of the A or B line. The difference of 
the A integers equal difference of the B integers. 
If the numbers are on different sections of the A line in the first case, or 
of the B line in the second case, difference of A or B integers equals difference 
of B or A integers plus one, if the answer is on the right hand section; minus 
1 if the answer is on the left-hand section.— Harmer and Grazier. 
UNITED STATES BUREAU OF FORESTRY. 
The Bureau of Forestry, as a distinct division of the United States 
Department of Agriculture, was authorised by the last Congress, and $185,440 
was appropriated for its maintenance. The appropriation for the previous 
Division of Forestry was $88,520; and for 1898-99 it had only $28,520. But 
this Division of Forestry made an assured success of practical forestry, and led to 
many improvements in forest management. Field work is to go on in seventeen 
States this summer, with 179 persons engaged in the work of the bureau, 
eighty-one of these being students, assistants, or young men who are preparing 
to take up the forestry as a profession. The matters studied are tree-planting, 
the relation of forests to the volume of streams, erosion, evaporation, irrigation, 
water supply, regulation of grazing lands, study of forest fires, &e.— Engineering 
News. 
