PHYSICAL PROPERTIES OF THE ALLANTOIC AND AMNIOTIC FLUIDS OF THE CHICK

Abstract

These two fluids were studied over the period of development between the 7th and 19th days of incubation. For the allantoic fluid, specific conductance was at a maximum at the 7th day, with values of about 116 X 10-4 mhos/cm. By the 8th day, this value had decreased to about 100 X 10-4. A gradual rise was then indicated to 110 X 10-4 at about the 16th day. From the 16th to 19th days, conductance values varied considerably, but the general trend was a decrease to values of about 76 X 10-4 by the 19th day. For the amniotic fluid, conductance values were higher during the early stages (to about the 13th day), ranging around 132 X 10-4 mhos/cm. A slight maximum may occur on the 11th day. Beginning on the 14th day, conductance decreased rapidly to a minimum around 83 X 10-4 on the 15th-16th days. It then increased, reaching a value of about 123 X 10-4 on the 19th day. These changes in specific conductance represent changes in the amt. of ionization; especially in the case of the amniotic fluid, they confirm the results of earlier chemical analyses.