428 M. E. COLLETT. 



ever, until we have adequate analyses we cannot offer a definite 

 explanation of the characteristic differences in the behavior of 

 these ciliated cells toward reagents. 



SUMMARY. 



1. Cilia which are resistant to saponin are generally resistant 

 to hypotonic sea water and hypotonic NaCl. The reversal of 

 resistance found with erythrocytes does not hold with cilia. 



2. Relative resistance of cilia to hypotonic NaCl is not the 

 same as resistance to hypotonic sea water, although the irregu- 

 larities are not numerous. 



3. Most of the cilia show a change in resistance with change 

 in temperature. This is more marked in saponin than in hypo- 

 tonic sea water. 



I am indebted to Dr. M. H. Jacobs for suggesting this problem 

 and criticizing the results, and to Dr. C. E. McClung for the use 

 of a table at the Marine Biological Laboratory at Woods Hole. 



BIBLIOGRAPHY. 

 Harvey 



'14 Internat. Zeit. f. Ph-Chem. Biol., I. 

 Hoeber 



'13 and '14 Physikalische Chemie d. Zelle, 2te u. 3te Aufl. 



'08 Biochem. Zeit., 14. 



'14 Biochem. Zeit., 60, p. 131. 

 Kanitz 



Winterstein's Handb. d. vergleich. Physiol. (for analyses of corpuscles'). 

 Kagan 



'13 Folia Haematologica, 17, p. 211. 

 Matthews 



'13 J. Biol. Chem., 14, p. 465. 

 Port 



'10 Deutsch. Arch. klin. Med., 99, p. 259. 

 Rywosch 



'07 Pflueger's Archiv, 116, p. 229. 



