352 



MacDOUGAL— HYDRATION AND GROWTH. 



Hydration of Agar, Gelatine, Agar-Gelatine and Agar-Oat-Protein in 



Organic Acids and their Amino-Compounds at 16-17° C. Expansion 



IN Percentages of Dried Thickness. 



Concentration. 



Succinic Acid Aspartic Acid 

 Mol. Mol. 



Asparagin 

 Mol. 



Acetic Acid Glycocol! Mol. 

 Mol. ■' 



Agar. 



Gelatine. 



Agar 8 — Gelatine 2 Parts. 



presence of this substance. That this result did not simply appear 



by faulty comparisons was shown by the following replacement test. 



A trio of sections which had been swelled in distilled water to a 



