8 



in moist or dry conditions very well (see Table II). On January 23, 

 when the first examination was made in the infested seed (Series II), 

 eighty-one living and seventeen dead were, found in the pots which 

 had been buried under growing bersim, and 113 living and seventeen 

 dead in the pots buried in unwatered land. 



The "good" seed (Series I), gave similar results; here twenty-five 

 living and eighteen dead larvae were found Jn the pots buried under 

 bersim, and twenty-three living and five dead in the pots buried in dry 

 soil. Forty-nine larvae had disappeared. This disappearance is not to 

 be wondered at, as the gauze covering the pots had rotted away 

 entirely. 



Two months were supported quite as well as four weeks inter- 

 ment had been. On February 23, further sets of pots were dug up 

 and examined. The pots containing " infested " seed (Series II) 

 buried under bersim yielded 153 living Gelechia larvae and eighteen 

 dead ones, those buried in dry soil 132 living and six dead seed worms. 

 No pupae were found. 



In the ''good" seed (Series I) fifteen living and four dead larvae 

 were recevered from pots buried under bersim, one dead and twenty- 

 four living worms from the pots buried in dry land; seventy-six 

 larvae had disappeared. 



Although there were no double seeds in the "good" seed pots at 

 the time of burying (December 23, 1915) several were found when 

 the pots were examined, showing that some of the larvre had spun 

 seeds together in the interval. The instinct to spin up seeds appears 

 to have been stronger in the case of worms in moist surroundings. 

 Attention is specially drawn to the fact that a very large majority 

 of the worms were found inside seeds in Series I. 



Three months' burial were also supported by a part of the worms. 

 The numbers of worms found were, however, distinctly less than those 

 recovered in the earlier examinations, possibly on account of emigra- 

 tion for pupation. 



From these experiments it would appear that the hibernating 

 or full-fed larvre survive even if ploughed under or buried in seed, 

 or in bolls, and that they can exist for long periods under these condi- 

 tions. 



Consideration of all the facts submitted in this paper makes it 

 appear probable that hibernation of full-fed larvae is induced by the 

 temperature of their surroundings at the time of their reaching maturity. 



