390 



Scientific Proceedings (124). 



It will be seen that the agreement between these two methods is 

 very close. The chemical method permits of a direct determina- 

 tion of the amounts of strophanthin. 



Assay of Strophanthus Preparation's. 



Kind of Preparation. 



Strophanthus, amorphous, Merck . 

 Tincture strophanthus 



" , hispidus seeds 

 , kombe seeds . 

 Infusion strophanthus hispidus .... 



kombe 



hispidus .... 

 one month old 



Chemical 

 Assay. 



mg. = c 

 0.135 

 7.8 

 8.7 

 i-95 

 1.87 

 3-o6 

 1.26 

 2.88 

 i-75 

 1. 19 



a. 1 



Biological. 



Assay. 



Det 



mg. = c.u. 





0.116 



2 



7-6 



2 



8-7 



3 



1.78 



5 



2.04 



3 



2.85 



4 



1.24 



3 



3-o8 



3 



i-5i 



3 



1.40 



3 



No. of 



cat unit of Hatcher and Brody. 



191 (1938) 



Regeneration in Spathidium spathula and Blepharisma undulans. 



By E. LUCILE MOORE (by invitation). 



[From the Osborn Zoological Laboratory, Yale University, 

 New Haven, Conn.] 



In a study of regeneration of form and function at various 

 phases in the life history of the infusorians Spathidium spathula 

 and Blepharisma undulans, it has been determined that the power 

 of restoring lost parts and of continuing normal existence is in all 

 cases dependent upon the same factor, the nuclear content of the 

 fragment. Individuals of known pedigree were cut transversely, 

 and the behavior or the fragments observed until regeneration 

 and division or regeneration and death had occurred. During 

 the vegetative state, regenerative power is highly developed in 

 both ciliates, but because of the more distributed condition of 

 the nucleus in Spathidium than in Blepharisma relatively smaller 

 fragments from either extremity of the former are capable of com- 



