24 



MASS. EXPERIMENT STATION BULLETIN 261 



o S-o 



C O 



s ■ 



3i^ ft 





s 2 ^ 





OOcOO(MOiCt--*0> 



in 00 t- lo ;o c- 00 CO 00 



lo o lo o c^i o lo t- in 3) 

 c)Ot>inoiincotDrHO 



CO 00 t- in <o t- 00 to 00 



inoinocjooc-Ttoi 



ooin ;ciooo'HT)<ai 

 «' o in ; ^ t-' i-I in •* o 



?] (M ■ OJ C5 Ol (M N CJ 



t-;OiH ; iH O •* N 05 CI 



Tjioo iinointOTilin 



t-Oi-io)oqiNxot~t- 



00 O) CO 



CO [-' I> 





00 CO O: t 

 00 Tji CD I 



coo)'*cot-oo)incoco 

 iHinNiHcqiMi-iiHiN-* 



00 o» o ^ ■* 

 ci tH 00 CO 00 

 o ooooo CO 



00 35 o OS in 



oi r-i 00 CO rH 



05 O) WOO CO 



00 Oi O C35 •* 



KN-HOliHcqrtpH ci 



r-l CO O N Ol 



in in CO in 't 



00 <N O t~ t- 



f-J N CJ r-I i-i 



00 iH CO ooo 

 ^ ^ t^ tJ* t^ 



coeoooo50int-c-io 



cocooooioinc-cio 



CO CO 00 c o in c- ri o 



OOfH iCOCOOOrHClO 



t> in 



coco' 



CO O ■* C^ rt o 



in CO in CO in CD 



COCICJINOOOOOON 



ci (N CO ci ci iH ci r-i' ci 



•t O tJI O rH CO CD 02 CO 00 



oinin-^t-TJco't^oo 



cococ)t-ino)int-o 



iH iH 1-1 CO Cl iH <H Cl Cl 



O) d iH OS 



CO CO ci ci 



o Tt oco o 



C- d t- 



