PJkANTS — INSECTICIDAL PROPERTIES. 7 
the others were brought home. The latter were afterwards ground 
and some of the powder was sent to the writers by Dr. C. H. Eigen- 
mann, who was in charge of the expedition to Peru and Ecuador. 
According to a letter from Doctor Allen, "cube" or "barbasco" is 
a woody shrub whose roots contain a milky sap of a very poisonous 
character. In Peru the sap is used as a wash for cattle to kill ticks 
and the roots are unlawfully employed to poison fish in streams. 
(See pp. 10 to 20.) 
The following results were obtained by using " cube." The powder 
(No. 501), used as a dust, was efficient against potato-beetle larva? 
(Table 1) and four species of aphids (Aphis spp. A and B, A. 
rumiciS) and Macrosiphum solanifolii. Table 2), but inefficient 
against Macrosiphum sp. A; used as a fumigant, it was efficient 
against Macrosiphum sp. (Table 3) and the one species of lady- 
beetle tested; used as an infusion (No. 501c), it was efficient against 
Aphis rumicis and Macrosiphum solanifolii; used as a decoction (No. 
501a), it was efficient but slow against Aphis spp. A and B ; and used 
as a hot-water extract (No. 501b), it was efficient against the same 
species. Used as a cold-water extract (No. 528, Table 7) with soap, 
it had practically no effect on Macrosiphum solanifolii, M. sp. C , 
and Aphis sp. E. 
The cold alcoholic extract (No. 50G) of "cube," used without soap, 
was efficient against silkworms and Macrosiphum sp. A (Table 5) ; 
used with soap it was efficient against Aphis spp. A, B* and E 
(Tables 4, 6, and 7), Macrosiphum sp. A (Tables 5 to 7), M. rosae, M. 
solanifolii, M. sp. G, Aphis spiraecola (Table 6), M. liriodendri, and 
against potato-beetle larvae and sawfiy larva?, but inefficient against 
webworms and the adults of potato beetles; and used with kerosene 
emulsion, it was efficient against Macrosiphum solanifolii, M. sp. G, 
and Aphis spp. G, D, and E (Table 6). The hot-water extract (No. 
525). used with soap, was efficient against Macrosiphum sp. A, but 
inefficient against Aphis sp. E (Table 7). The benzene extract, used 
with soap, was efficient against Macrosiphum^. A (Table 5), and M. 
rosae. The dry resin (No. 526) from the powder, dissolved in 
alcohol and used with soap, was inefficient against Macrosiphum 
solanifolii^ M. sp. C, Aphis spiraecola, and A. sp. E (Table 7). 
The filtrate (No. 527), obtained from a cold alcoholic extract which 
had been concentrated, precipitated in water, and filtered, was prac- 
tically ineffective against macrosiphum solanifolii, M. sp. G, and 
Aphis sp. E (Table 7). 
The powder of " cube," dusted into the hair of three cats badly in- 
fested with Mallophaga, was efficient, but the cats became sick from 
licking themselves. 
DERRIS. 
Following are the summarized results, obtained by using a com- 
mercial powder, consisting of a mixture of Derris eUiptica and 
D. uliginosa. The powder, used as a dust (No. 110, Table 2), was 
efficient against three species of aphids (Aphis sp. A and B, and 
Macrosiphonella sanbomi), and silkworms (Table 1), but killed 
only about half of the Macrosiphum sp. A tested within 24 hours: 
used as a decoction (No. 110a, not filtered) and also as a hot- water 
extract (No. 110b, filtered), it was efficient against Aphis sp. A and 
B (Table 3), and used as a fumigant (No. 110) it was efficient 
