Culture Forms of Trypanosoma ranarum (Lankester, 1871). II. Effect of Temperature upon Reproduction and Cyclic Development*

SYNOPSIS. Cultures of Trypanosoma ranarum at room temperature, 20° or 25°C had similar patterns of growth and cyclic development, i.e., change from pear‐shaped to slender forms. At 9° the cycle of development and reproduction was compressed, but returned to normal after introduction to optimum temperatures. A compressed cyclic and reproduction rate was noted at 31° but return to optimum temperature did not reestablish normal cultural development. At 35° all flagellates were killed after 24 hr. The relation between reproductive capacity, cyclic development, and temperature is discussed speculatively.