THE PROTOZOA OF THE PITCHER PLANT. 2/3 



house fly (?), one spider, one lace-wing fly; insect larvae, 

 living, many; mites, few; rotifers, many. 



5. Mature pitcher containing 8 cc. of cloudy liquid. Protozoa, 



several varieties of cercomonas-like flagellates, many 

 ridged flagellates, many amcebulae, several Umax amoebae, 

 several actimospherium-like rhizopods, many prorodon- 

 like ciliates and many holosticha-like ciliates; insects, 

 few, badly decayed; insect larvae, living, many; rotifers, 

 many; nematodes, many; entomostraca, few. 



6. Mature pitcher containing 12 cc. of clear liquid. Protozoa, 



several cercomonas-like flagellates, many ridged flagellates, 

 one amoebula ; insects, few, badly decayed ; insect larvae, 

 one; rotifers, many; entomostraca, one. 



7. Young pitcher containing 17 cc. of clear liquid. Protozoa, 



many cercomonas-like flagellates; insects, few; insect 

 larvae, many; mites, few; rotifers, few. 



8. Young pitcher containing 25 cc. of milky liquid. Protozoa, 



few bodo-like flagellates, few amoebulae, many holosticha- 

 like ciliates; insects, few; insect larvae, many; mites, 

 few; rotifers, few. 



9. Young pitcher containing 19 cc. of clear liquid. Protozoa, 



many amoebulae, many bodo-like flagellates; insects, 



many; insect larvae, many. 

 10. Young pitcher containing 17 cc. of clear liquid. Protozoa, 



many cercomonas-like flagellates, few mastigamceba-like 



flagellates, few bodo-like flagellates; insects, few; insect 



larvae, few; mites, one; rotifers, few. 



Protozoa were present, as noted, in all ten pitchers and all 

 three classes of free-living protozoa were represented by several 

 species. The liquid from many other pitchers was examined in 

 the experiments described below and similar protozoa were 

 found in most of them and probably would have been found in 

 all if a more careful search had been made. The most common 

 living organisms encountered in the pitchers were insect larvae, 

 mites and rotifers. Nematodes and entomostraca were found in 

 a few of the pitchers, and tardigradas in one. 



How does the pitcher liquor become populated with protozoa? 

 So far as I know no experimental data on this point exist. The 



