Dear PAVLOV, there were actually three winter gardens in the WP. Yes , you are correct, one of them (the smallest one) was done away with during the end of XIX century reconstruction (N&A remodeling, if not earlier). There were other two: one overlooking the main courtyard, entrance from the long (Pompeian) Gallery, running along the Neva Enfilade, the other was actually in the building next door, not the WP proper but in the Small Hermitage: the entrance was from the Pavilion Hall, and that winter garden overlooked the Hanging Garden of the Small Hermitage. However, taking into account that SH was actually incorporated into one of the Reserve Apartments WP annexes, we may say that the SH winter garden was the largest of these three.