A Pittsburg correspondent wants to know why, as pears on the quince stock are so much cheaper, he should not plant them in preference to the more costly standard. We cannot answer the question to our mind, because we do not know the circumstances. But in a general way we may say that for orchard culture few persons would plant anything but Standards. They are generally more enduring, and in a long term of years we believe more profitable. It is to be said to the credit of the pear on quince, however, that it requires more knowledge and skill than on its own roots. People ignorant of all horticultural knowledge should have nothing to do with dwarf pears. Those who are skilful in pruning, and know how to give them plenty of good food and not too much, may beat the standard pear grower with them. But the number of these good fellows is few.