740 PEOCEEDIXGS OF THE THIRD EXTOMOLOCICAL MEETIXG 



The grains were smeared witli'the oils. Camphor and naphthaline 

 were placed inside the grain. Sand. etc.. wa"fe placed on the top of the 

 grain. The mouth of the vessel was plugged with cotton wool. Carbon 

 bisulphide was placed inside the vessel and the cover pla-stered up at 

 once. In No. 11 the grains were sunned for three days, then placed 

 while hot in the vessel which was plastered up. 



The weights give an idea of the damage. In the germination 

 columns no test was made for samples left blank. 



B.— In the first week of May 1916 220 pounds wheat, Pusa No. 6,. 

 obtained from the Pusa Farm, were stored in 10 earthen vessels. Iiv 

 the midst of the grain in each vessel J oz. of camphor cakes ^vrapped 

 in a piece of muslin was placed. The mouth of five of the vessels was 

 plugged with cotton wool which formed a compressed padding about 

 1 to II inches thick over which a tliick plaster. 1| to 2 inches of mud, 

 was placed. The mud dried and made a hard solid cover. The mouth 

 of the other five vessels was covered with the ordinary earthenware 

 cover (Plate 111, fig. 3), which was very carefully plastered down 

 with mud. 



180 lb. of the same wheat were stored in five kerosine tins similarly 

 with camphor cakes, the openings of the tins being plugged with cotton 

 wool and plastered with mud. 



The kerosine tins were opened in July-August and the grains in 

 tliem were observed to be afiected by Rhizopertha dominica in company 

 with TriboUum casteneum. The last tin, opened on the 7th August 

 1916, had the grain in the top four inches badly damaged by the above 

 insects, the grains below being safe. 



The ten earthen vessels were opened on the 8th September 1916. 

 The entire grain was spoilt by the same two insects. There were millions 

 of them and their grubs and pupcE. Much of the grain was reduced 

 to a flour-like dust and the whole mass had a very disagreeable nauseating 

 smell due to Tribolium. The dust being sieved out weighed more 

 than 40 lb. and the grains about 170 lb. Most of the grains were 

 bored and had insects in them and it was estimated that the atta fi-om 

 them would not be more than about one-third this weight. The atta, 

 however, would be quite unusable. 



The insects bored through the mud plasters. 



C. — Pusa No. 6 wheat was harvested and stored in April 1915 in' 

 kerosine tins in a private house with camphor cakes, the small holes of 

 the tins being tightly plugged with cloth. 



A tin was opened in September 1917. The seeds were free and the 

 peicentage of germination obtained in October 1917 was 95. 



