136 



Scientific Proceedings (119). 



These results indicate that premature children, after a short 

 period of retarded growth incident to the adjustment to the 

 extrauterine environment, tend to regain the fetal rate of growth 

 and to follow this course of growth until some time in the latter 

 part of the first year when the rates of fetal and postnatal growth 

 approximate one another. In other words the growth tendency 

 of prematures is in general that of fetuses of the same size and 

 age rather than that of full-term children. These results are in 

 agreement with those of Hammett 1 on growth capacity and body 

 weight in the first two weeks of postnatal life, and with certain 

 findings of Cammerer, 2 but seem to be in opposition to some of 

 the conclusions of Schwarz and Kohn 3 and of Ylppo. 4 That this 

 opposition is apparent rather than real will be shown in a later 

 communication. 



68 (1815) 



An undetermined principle obtained from poison ivy. 



By E. D. BROWN. 



[From the Department of Pharmacology, University oj Minnesota, 

 Minneapolis, Minn.] 



An undetermined principle has been obtained from poison ivy 

 which so far as I have been able to find differs in its behavior from 

 that of any substance previously described. 



It came down as a precipitate after long standing of a filtrate 

 after precipitating with lead acetate. 



No work has as yet been done with the substance except to 

 determine a few of its properties. 



It is non-irritant when applied to the skin, neutral to litmus 

 and is bitter to the taste. It has a melting point of 190 0 when 

 heated slowly, insoluble in cold water and fairly soluble on boiling, 

 imparting a lemon yellow color to the solution. It is soluble in 

 ammonia water, acetic acid and hot alcohol. Insoluble in alcohol 

 in the cold, ether, chloroform, petroleum ether and acetone. It 



1 Hammett, F. S., Amer. Jour. Physiol., 1919, xlv, 396. 

 1 Cammerer, W., Jahrb. f. Kinderheilk., 1900, liii, 381. 

 'Schwarz and Kohn, J. L., Amer. Jour. Dis. Children, 1921, 296. 

 * Ylppo, Zeitschr. f. Kinderheilk., 1919, xxiv, 179. 



