748 rROc?:EDiXG.s of the thikd T-xtomological meeting 



(1) This was left as a check. 



7th Januarj' 1918 . . 490 Tribolium castaneitm and 980 Culandra on/zce adults 



were picked out. Benzine was put inside the jar to 

 stupefy the insects and then the grains were aired and 

 put back. The grains weighed 1 lb. 1.5} oz. 



8th November 1918 . 4,315 Calandra oryzce and 17 Tribolium caslaneum adults 



were picked out after being stupefied with benzine as 

 before. Many grains were bored ; otherwise the wheat 

 was in good condition. 



(2) In the second jar the wheat was covered with a layer of about 

 7 inches of dry fine sand — 



4th June 1917 . . Tribolium and Cn/a/if/ra adults came up to the top of 



the sand. 



7th January 1918 . - . On the top of the sand there were 651 dead and 4 living 

 Tribolium and 18 dead Calandra adults. In the 

 sand and wheat there were 41 dead Tribolium and 4 

 dead Calandra adults. Plate 122, fig. 2, gives the photo- 

 graph of this jar. The wheat was unaffected, though 

 a few grains were bored, and weighed 2 lb. The 

 sand was thrown out and the wheat kept in the jar 

 without sand. 



Sth November 1918 . Wheat unaffected. There were 4 dead Tribolium and 1 

 dead Calandra adults. 



(3) The wheat was kept under sand ag in (2), but this sand was 

 sterilized by being heated over a fire and cooled before use — 



14th June 1917 . . Calandra and Tribolium adults came up to the top of 



the sand. 

 7th January 1918 . . On the top of the sand there were 457 dead Calandra 

 and 2 dead Tribolium adults. From the sand and 

 wheat were picked out 35 living and 1 dead Tribolium 

 and 85 living Calandra adults. The wheat weighed 

 2 lb. and was unaffected, though some grains were 

 bored. The wheat kept without sand. 

 Sth November 1918 . 1,936 Calandra adults present in the wheat which was 

 distinctly affected and weighed 1 lb. 14 oz. 

 The percentage of seeds which germinated within a week in January 1918 was 90 in 

 ■(1), 93 in (2), and 87 in (3). The sand itself has no injurious effect on germination. Tliis 

 was further corroborated in the next experiment. The percentage of germination of 

 seeds in (1), after they were benzined, was 88. 



Experiment XV. 



In the previous experiments it was observed that Rhizopertha dominica 

 was ehminated if closed receptacles were not used. This experiment 

 was made to give extended trials to sand and to see if free air and light 

 {also Sun) had any retarding effect on Calandra onjzce. The entire 

 experiment was started in April 1917 with the Black-awn variety of 

 wheat obtained fi-om the Pusa Farm. As observed in Experiment XIV 

 the wheat was already affected before storage. The details of the 

 experiment are given in the Statement below. 



