408:Which & What

_______ was first manufactured as an insecticidal powder in the 1870s by J. Hagemann, a German immigrant to Australia. It is said that Hagemann himself came up with the name _______, with a little help from his French wife: the famous name is a combination of the French word and the German.Hagemann used crushed chrysanthemum flowers to produce a pyrethrum extract. The powder was originally sprinkled about, and in the 1920s a squeeze puffer was developed. Hagemann introduced a liquid version in 1928. He combined this with kerosene and had a pump pack designed which allowed the insecticide to be sprayed into the air or onto the pests themselves.

Ans:Mortein