DIVISION RATE IN CILIATE PROTOZOA. 



307 



to indicate that Paramcecium is rather more susceptible to thy- 

 roid ingredients than is Stylonichia. 



Results from Use of Fish Thyroid. 



Results from Use of Amphibian Thyroid. 



Results from Use of Reptilian Thyroid. 



Results from Use of Avian Thyroid. 



