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Dierential Stromgren uvby observations from the Four College Automated Photoelectric Telescope are presented for the mCP stars HD 35298, 19 Lyr, HD 192678, and HR 8216. The period for HD 35298 of 1.85457 days is a revision of North's value while that for 19 Lyr of 7.0980 days is alias of that found by Winzer. HD 192678 is found to be a small amplitude photomet- ric variable with the 6.4186 day period proposed by Leroy from polarization measurements. For HR 8216, observa- tions taken between 1995 and 1998 conrm that the star has remained constant at least since 1990.

uvby photometry of the mCP stars HD 35298, 19 Lyrae, HD 192678, and HR 8216