In Part VI of this series of memoirs (1) I recorded a number of experiments and observations on the excretory processes of the earthworm Pheretima posthuma. The presence of urea and ammonia in both the blood and coelomic fluid of the earthworm clearly indicated that both these fluids take their share in the transport of metabolic wastes from the tissues of the 1 ody to the nephridia. It was also found that the bodywall and intestine, the two main seats of metabolism in the earthworm, were also the two main places of initial excretion of urea and ammonia ; in fact, the proportion of urea and ammonia is higher in the body-wall and intestinal wall than in the coelomic fluid or blood or urine, the proportion of urea being the highest in the intestinal wall. No trace of uric acid was found in any part of the body....

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