114 Bulletin de la Société Entoniolof/iqiie (VEfjijpte 



nunil)er of green bolls per 1000 cotton plants for Lower 

 anti Middle Kgypt. This curve was necessary as it was 

 desired to translate the figures obtained in the investi- 

 gation from percentages to average total numbers per 

 1000 plants. 



Detailed tabk>s showing the figures obained are to 

 Ije pid)lished elsewhere, and it is intended only to sum- 

 marise the results here briefly. 



On the annexeddiagram linee curves have l)ecn plot- 

 ted out. The first shows the average number of green 

 bolls per 1000 cotton plants for each week from .luly 

 .Sth to October 27th 1916. 



This curve it will be seen rises fairly fast until the 

 P* week of August when »SJiOO green bolls per 1000 trees 

 were found and after rising at a less quick rate reaches 

 its maximum of nearly 10200 green bolls per lOOOtrees 

 during the first week of September. From this date on- 

 waids it falls in nearly a straight line until the last 

 dale calcidated, the last week of September, when only 

 al)out 5200 green bolls per 1000 trees were recorded. 



The percentage curve for (lelechia remained fairly 

 Hal until the second week of August (^^%-S)% ) then it 

 commenced rising at a fairly uniform jiace until the 

 second week of October when SO % infestation of green 

 bolls was reached. Aller lliis the percentage of bolls 

 atlack(Ml began to fall irregularly. 



As against this the actual numj)er of Gelechia infes- 

 ted bolls jier 1000 trees increases slowly from about 

 270 in the second week of July to aboutcSOO in thesecond 

 week of August. After this it rose steadily until the 

 third week of September when al)out 4000 infested 



