This variety has never done particularly well here, only producing blossom a couple of times over the 10 years or so since planting. Probably one of the most disappointing fruit varieties I've grown (along with the Sturmer Pippin which was sent in error by a well-known nursery). My dim recollection of the last time it produced any fruit was that the crop wasn't even particularly early.
The best thing I can say in favour of Dr Jules is that the young fruits are a very decorative dark red.
Bud break April 4th, full flower 8th, 50% petal drop 12th)