L. R. CLEVELAND. 



termites the reader is referred to the first article of this series, 

 "Correlation between the Food and Morphology of Termites 

 and the Presence of Intestinal Protozoa." 



All of the known termite protozoa, except Gregarina termitis 

 and Nyctotherus termitis, have been placed in two orders of flagel- 

 lates, the Polymastigina and the Hypermastigina, the latter being 

 the most highly specialized order of flagellate protozoa. 



3. BIOCHEMICAL CONSIDERATIONS. 



Dore (1920) gives the following analysis of yellow pine (Pinus 

 ponderosa) oven-dry (100 C.) basis. Results in percentages. 



Benzene extract 2.22 Lignin 29.47 



Alcohol extract . 1.49 Xylan . . 3.49 



Cellulose 57-72 Mannan 6.37 



Galactan 0.78 



The two following examples are taken from Ritter and Fleck 

 (1922), who have analyzed a large number of American woods: 



Analysis of a mean of four samples. Results expressed in 

 percentages of oven-dry (105 C.) material. 



Western Yellow Pine Tanbark Oak 



(Pinus ponderosa). (Qtiercus densi flora). 



Moisture 6.42 .... ... 3.66 



Ash ... 0.46 .. ... 0.83 



Solubility in cold water 4-9 4.10 



Solubility in hot water 5.05 5.60 



Solubility in ether 8.52 0.80 



Solubility in i % NaOH 20.30 23.96 



Acetic acid i .09 5.23 



Methoxy. . .. 4.49.. . 5.74 



Pentosan 7.35 19-59 



Mfthyl pentosan 1.62 none 



Lignin 26.65 24.85 



Cellulose 57.41 58.03 



In the cellulose: 



Pentosan 6.82 22.82 



Methyl pentosan i .98 none 



/l//>//a-cellulose 62.10 56.77 



ZJe/a-cellulose 10.56 19.92 



Cawwa-cellulose 3-i3 23.93 



That the principal food of most termites is cellulose is a fact 

 which appears to have escaped the attention of physiologists and 

 biochemists. Because of this, and also owing to the fact that our 



