Many forms of apparatus have been devised for the purpose of holding infants and young children in positions suitable for the collection of urine and feces separately. Every investigator who has attempted to place a wriggling, squirming, kicking baby in one position and keep it there for any length of time knows with what difficulty it is accomplished. Many an enthusiastic worker has spent the entire morning trying to corral the subject of investigation only to learn, on turning his back, the

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... uth of Burns' couplet, The best laid schemes o' mice an' men gang aft a-gley.