252 



Scientific Proceedings (121). 



with tinctures and fluidextracts, the difference is an average of 

 18.6 per cent. The intramuscular method gives more constant 

 end points and, therefore, requires less time and material for an 

 assay. Lot I, fluidextracts, illustrates this point. With this 

 preparation we were unable to determine the effective dose on 

 account of poor absorption even with injections of doses 20.6 per 

 cent, above the intramuscular dose. Even ouabain, generally 

 considered as satisfactorily absorbed from the lymph sac, has 

 required an average dosage 15.6 per cent, less by the intramuscular 

 method. Earlier experiments have been repeated at a different 

 season on different lots of animals with similar results. 



It is believed that division of the dose, better blood supply in 

 muscle than in skin and massage from movements of the animal, 

 account for the more constant results and for the smaller intra- 

 muscular dosage required. 



Abstracts of the Communications, Minnesota Branch. 

 Minneapolis, Minnesota, February 8, 1922. 

 Third Meeting 

 in (1858) 

 Evidences of a structure in gelatin gels. 



By ROSS AIKEN GORTNER and W. F. HOFFMAN. 



[From the Division of Agricultural Biochemistry, University of 

 Minnesota, St. Paul, Minn.] 



Bancroft 1 recently reported some conclusions drawn from 

 unpublished data of a Mr. Cartledge who dried gelatin gels of 

 different concentrations down to a 96 per cent, gelatin content 

 and then allowed these dried sheets to again imbibe water. It was 

 found that "each swelled rapidly to the original concentration 

 and then took up water slowly." 



We have conducted experiments similar to those of Cartledge 

 and have secured comparable results. Thus a 10 per cent, gelatin 



1 Bancroft, W. D., "Applied Colloid Chemistry," 1921. p. 251. 



