















a 
a i Be 
le: Given 300 gale. stock solution kerosene emulsion. 
To find amount of water to add to make a 4% solution. 
(2/3 of 300) 
ing @beve formula. (--------- ~) - 300 = Q 
a ( 04 ) 
Or, 2/5 of 300 = 200 
(200) 
(==) = §000 
(.04) 
5000 - 300 = 4700 = Q . 
conversely, © Q@ = 4700 gals. = quantity of water 
St to add; 
4a . QED * 
f) 2700 gals, of water + 300 gals. of stock spi 5 n = 5000 gals. 
4g of 5000 = 200 = the amount of kerosene content. 
W. E. Pennington. 
% E. ©. G. KELLY WANTS A NEW INSTRUMENT FOR DIGGING INSECTS. 
Im cereal and forage insect investigations we find a great number 
Beteccts in the soil, and it has been a source of considerable study 
t an instrument suitable for the purpose of doing this sort of 
We have tried a number of instruments at the Wellington Laboratory 
merein is the list; if any one can add to the list one better suited 
i11 be appreciated. In the first place something light, strong and 
Pr for carrying is required. We have used an automobile spade with 
c able handle, a light garden hoe with handle cut down to 18 inches 
gth, 2 planters hoe with handle cut short, a hatchet, a "Marble" axc, 
-" blade chisel, 2 butchers knife, and a putty knife and are free to 
8S that we would like abetter instrument than any of these. 
BE. 0. G. Kelly. 
DECIDUOUS FRUIT INSECT INVESTIGATIONS. 

A. L. Quaintance, in charge. 
Messrs. H. G. Ingerson and H. K. Plank, graduates of the Penn- 
nia State College, have been appointed as scientific Assistants, 
work beginning April 18, 1914. 
+ Mr. E. H. Siegler has left California, where he was assisting in 
work for the control of the pear thrips, returning to the station at 
fon Harbor, Mich., for the purpose of carrying on experiments with 
oticides ‘against orchard insects. 
A laboratery has been established at Winchester, Va., for con- 
ing studies in the life history and methods of control of the peach 
borer and orchard plant-lice. Mr. B. B. Blakeslee will be in charee 
oT. 
= 

