24 JO URNAL, BOMB A Y MA TURA L HISTOR Y SOCIETY, Vol. XVIII. 



bamboos exposed to light and air are less liable to attack than those not so 

 exposed. 



South Coimbatore, 

 18th February 1899 and ls« November 1899. 



A series of experiments were made on two occasions at Mount Stuart, one 

 from the 2nd August to 1st September 1898, and the 2nd from the 10th March 

 to 12th April. On each occasion 10 large bamboos (Bambusa arundinacea') and 

 10 small (Dendrocalamus strictus) were cut daily. Each bundle of 10 was 

 labelled aad the bundles were all laid out in a row. Those cut on the first 

 occasion were examined one by one on 2nd February 1899, with the result that 

 the influence of the different phases of the moon did not appear to have any 

 bearing upon the presence or absence of the borers. On the 2nd occasion one- 

 half of the length of each bundle was covered with mats, the other being left 

 uncovered. This was done in order to observe the effect of shade as a pro- 

 tective influence or otherwise to the bamboos. The bamboos so treated were 

 examined at the beginning of October. It was found that the portions cf the 

 bamboos covered over by the mats had double the number of boring insects at 

 work in them than were to be found in the uncovered portions. Thus the 

 insects atta <k bamboos stacked in the shade twice as heavily as those stacked 

 under the full rays of the sun. 



The following were the percentages of attack observed in the case of the 

 two species of bamboos experimented with : — 



Bamboo. 



Percentage attacked 



by borers ■ n the 



fit si occasion. 



Percentage attacked 

 by b re s <>n the 

 second occasicn. 



Bambusa arundinacea... 



Dendrocalamus strictus 



34*33 



41'66 



It will be noted from the above that the percentage of attack in the case of 

 Bambusa arundinacea varies considerably, being much higher in the case of 

 the bamboos cut in August than in the case of those cut in March-April. In 

 the case of Dendrocalamus strictus, however, the percentage of attack differs 

 but little, the increase inclining to those cut in the spring months of the year. 

 To be conclusive, further experiments with a larger number of bamboos should 

 be carried out in this Division. 



South Malabar, 



Uh October 1899. 



A series of experiments were made from 2nd August 1898 to 7th April 1899, 

 both at the full m< on and new moon periods. On each occasion a bundle of 

 25 bamboos was soaked in mud and water, while a second bundle was merely 

 stacked. The experiments seemed to show that neither the soaking nor 



