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This is not an infallible rule, as in the case of older fields in which immature bark is being tapped, it is to be noted that the dry rubber content of latex may be less than that of latex obtained from younger trees. The beaches of the glacial lakes just mentioned are now far from horizontal. Pour or six brass plates, termed "gills" or "stocks," fixed to the rod. I must confess to a very considerable shudder when we discovered the reason of their screams, and neither of us seemed to enjoy the circling and croaking of the unclean birds.