for about twenty years I have been watching infants in my clinic at the Paddington Green Children’s Hospital, and in a large number of cases I have recorded in minute detail the way infants behave in a given situation which is easily staged within the ordinary clinic routine. I hope gradually to gather together and present the many matters of practical and theoretical interest that can be gleaned from such work, but in this paper I wish to confine myself to describing the set situation and indicating the extent to which it can be used as an instrument of research. Incidentally I cite the case of an infant of seven months who developed and emerged out of an attack of asthma while under observation, a matter of considerable interest in psychosomatics.