42 SCIENCE PROGRESS. 



dently and arrived at the same result. To take Chittenden l 

 first. He found that the proteoses though diffusible were 

 not nearly so much so as peptone. A curious fact which 

 was unexpected was that deutero-proteose is less diffusible 

 than proto-proteose. Proto-gelatose is fairly diffusible, but 

 it has a somewhat lower endosmotic equivalent than the 

 corresponding proteose. Elevation of temperature increases 

 the rate of osmosis, especially of the proteoses. 



I give in conclusion the figures from Kiihne's paper, 2 

 which illustrate these facts. Hetero-proteose is the least 

 diffusible of the proteoses ; in neutral saline solutions it is 

 precipitated, and none passes through the dialyser ; dis- 

 solved in ammonia it loses 5*22 percent. Deutero-proteose 

 comes next (loss 24" 1 per cent.) ; then proto-proteose (loss 

 28*3 per cent.) ; while peptone loses 51 to 51*8 per cent. 



W. D. Halliburton. 

 1 Journal of Physiol. , xiv., 483. 2 Zeit. Bio/., xxix., i. 



