THE CILIUM AS A KEY TO THE STRUCTURE OF 

 CONTRACTILE PROTOPLAS:\r. 



(). r. DELLINGER. 



Coiitrihiitioti from the Biological Luhoratonj of Clark rnircrsit!/. 



TABLE OF CONTENTS. 



r.Kr.F. 



Introduction : Statement of Problem 172 



Historical : Literature on the Structure of Protoplasm 173 



Sources 17?, 



Early views. 



Contractile protoplasm reticular or fibrillar 17^ 



Englemann's Inotagmas 17S 



Strasburger's Kino — and Trophoplasm 178 



Leydig's Ilyloplasm 17'.t 



Objections to the Contractile theory ISO 



Protoplasm a complex fluid or foam ISO 



Study of Cilia 182 



Point of view 182 



Observations on the tiner structure of cilia IS?. 



Theories of the structure of cilia 188 



My own observations on cilia 18.S 



Comparative study of the effect of reagents 18."» 



Other work ; Fischer, Hardy, and others 18r> 



Experiments 18G 



Conclusions 1*8 



Structure revealed by teasing 189 



Flagella of Euglena 190 



Cilia of Stylonychia 192 



Application of Methods to Other Contractile Tissues 193 



Protozoa. 



Amoeba 193 



Actinosphaerium 194 



Stentor 197 



Smooth muscle 198 



Stem of vorticella. 

 Striped muscle. 



Conclusions 203 



The Journal of Morphology. — Vol. XX, No. 2. 



