Mastitis in the male--a rare complication of mumps.

peak flow readings begins and hence this measurement is of less diagnostic value. Technically it is quite easy to alter the whistle so that more accurate readings are obtained above 300 1./min., but when this is done the performance of the whistle is less discriminating for small variations at low flow rates. Overestimation of the peak expiratory flow rate by the whistle is negligible (2%). The instrument, lacking the inertia of moving parts, can respond to very ephemeral periods of raised flow rate, such as may be found in patients with quite severe airway obstruction (the Wright meter does not respond to blasts of less than 10 msecs.). The whistle must be definite and produced with ease-if there is the slightest doubt, then "no-whistle" is declared.