1 Fex., 1898.] - QUEENSLAND AGRICULTURAL JOURNAL. 161 
in New York at the same time being 15 cents (74d.). As there must have 
been some London expenses, whether paid by the American Department or not, 
the average of the London prices did not equal the New York prices plus 
expenses. Some Massachusetts butter sent at the same time sold at half a cent 
(2d.) per 1b. less in London than it was’ worth in the district of its manu- 
facture. It is further stated by the American journal that the Minnesota 
butter was retailed to London consumers at an average of 7 cents (33d.) more 
than its wholesale price, and that the Minnesota Creamery Company got only 
half what consumers paid, while the farmers who supplied the milk obtained no 
more than two-fiths. 
AN INSECT FOE OF BEETS. 
Inrporturs of sugar-beet seed will not be pleased to learn, from La Feuille des 
jeunes Naturalistes, that an insect belonging to the order Curculionide (Boris 
spoliata, Bohem.) has commenced to attack the sugar-beet in Tunis. The 
insects destroy the*bulbs by boring galleries through them, and the beets rot 
away, becoming a mere mass of corruption. 
HOW TO CALCULATE INTERES?. 
Ir is often useful to know how to calculate simple interest without working 
out an intricate sum. The easiest method is to double the rate per cent., 
and multiply the principal by it. The answer, cutting off the last figure 
(which is tenths of a shilling), is then in shillings. For instance, suppose a 
person to havea loan of £250 at 73 per cent. The double of 7} equals 15. 
Then 250 multiplied by 15 gives 8,750. Cut off the nought; there remains 875 
shillings, which is £18 15s., or the interest on £250 at 73 per cent. Again, 
8 per cent. on £75 works out thus: 6 x 75 = 450. Cut off the. last figure, 
and the result is 45s. = £2 5s., the interest. 
PAWPAW JUICE. 
{xe pawpaw juice mentioned by Mr. J. I’. Bailey in his article on the Pawpaw 
(Queensland Agricultural Journal, Vol. I., Part 8) as being worth 10s. per Ib. 
in London, is now quoted at 5s. per lb., and is easily obtained from the unripe 
fruit. The Chemist and Druggist gives the following as the best method of 
preparing it:—The juice is pressed out of the fruit, clarified by filtration 
through a twill bag, and the ferment precipitated by alcohol. It is then dried, 
put is sometimes purified by treatment with water. 
WEEVILS IN CORN. 
Prorgessor Cuurcu says the only cheap and perfect application for the 
prevention of weevil upon corn and grains consists in the employment of 
bisulphide of carbon. ‘The quantity required, provided the grain is kept in 
close vessels, is very minute—not more than 1% Ib. to each ton of grain—so 
that Sd. is the cost of preserving a ton of wheat. The bisulphide leaves no 
disagreeable taste or smell behind, and the quality of the grain remains 
unimpaired, When bags are used, instead of iron cylinders, specially prepared 
for use in the bisulphide process, the protective influence of this chemical soon 
ceases, and a fresh application of the bisulphide must be made. In either case 
the liquid is applied as follows :—A. ball of tow is tied to a stick of such a 
length that it can just be plunged into the middle of the vessel containing the 
grain. The tow receives the charge of bisulphide like a sponge, and is then at 
once plunged into the sack or cylinder, and left there, the mouth being closed 
tightly. When necessary, the stick may be withdrawn, and the charge (1 oz. 
bisulphide to 100 lb. grain) renewed. : 
