ABILITY OF TERMITES TO LIVE OX PURE CELLULOSE. 293 



ADDENDUM. 



It is now eighteen months since these experiments were started. 

 The termites appear perfectly normal in every way. Thousands 

 of eggs have been laid during the past week, and several winged 

 forms have been produced. In some cellulose-fed artificial 

 colonies which contained ten adult individuals in the beginning 

 more than two hundred half-grown individuals are now present. 

 Thus, the weight of these colonies has increased more than forty 

 times on a diet of cellulose. 



Several attempt- have been made to determine whether <>r not 

 atmo.-pheric nitrogen is being fixed. The respiratory quotient has 

 been measured and, as would naturally be expected on a carbo- 

 hydrate (lift, has been found to lie practically i'i. \Ylur. 

 tern lit- ) are confined in air with barometric chat 



being noted and temperature being kept con-taut, a negative 

 pit --urc is very soon developed. This indicate- that nitrogen is 

 being !i\e<l, but analyses of air samples taken from tube- \\here 

 tin negative pressures have developed have shown very little, if 

 any, change in the nitrogen percentage. 



REFERENCES. 



Cleveland, L. R. 



'ija ' in between l he Food and Morphology of Termites and tin- 



1'ii'sence of Intestinal Protozoa. Amer. Journ. HVK-. 4. 444-61. 

 '236 Symbiosis between Termites and their Intestinal Protozoa. Proc. N 

 Acad. Sci.. 9, 424-28. 



'1 In- l'hy-i"l'>nical ar >d Symbiotic Relations). tin- Iini--iin.il 



Protozoa of Termites and their Host, with 

 litcrnifs thiripes Kollar. BIOL. BULL.. 46, i, 

 The Feeding Habit of Termite Castea and iu ;h'ir int---tiii.il 



KIOL. BULL.. 48, 295-308. 



1 In- : nation and Starvation on tin- Symbi. ilic 



1 -:::.;;-. 1 . and its Intestinal Fl.. !' >i . 48, 



JOG-. 7 



Dore, W. H. 

 '20 Tin- Proximal -is of Coniferous Woods. J. In-1. En.^. ( 'h--m., 12, 



