  Antonio Colla was a meteorologist and astronomer who made sunspot
observations at the Meteorological Observatory of the Parma University (Italy).
He carried out his sunspot records from 1830 to 1843, just after the Dalton
Minimum. We have recovered 71 observation days for this observer.
Unfortunately, many of these records are qualitative and we could only obtain
the number of sunspot groups and/or single sunspots from 25 observations.
However, we highlight the importance of these records because Colla is not
included in the sunspot group database as an observer and, therefore, neither
his sunspot observations. According to the number of groups, the sunspot
observations made by Colla are similar as several observers of his time. For
common observation day, only Stark significantly recorded more groups than
Colla. Moreover, we have calculated the sunspot area and positions from Colla's
sunspot drawings concluding that both areas and positions recorded by this
observer seem unreal. Therefore, Colla's drawings can be interpreted such as
sketches including reliable information on the number of groups but the
information on sunspot areas and positions should not be used for scientific
purposes.
