Oranges are hardier than lemons, and lemons are hardier than limes. They will all stand a good deal of frost, when at full bearing age, but cold weather causes a thick rind and a lack of juice, and in the lemon a lack of citric acid. Hence oranges from Riverside, in the interior, are quoted at $5.00 to $10.00 per thousand higher than those at Los Angeles near the coast. San Gabriel valley and the valley running fifty miles east and west and about twenty-five miles wide, in which are situated Pomona, Cuca-monga, San Bernardino, Ontario and Riverside are among the best known and most successful regions for the growth of citrus fruits. The atmosphere of these valleys is so dry and warm in summer that the scale will not be found on one tree in a hundred and the black fungus is unknown. Here the oranges ripen from January to June and ought not to be shipped before March, when the Florida crop is gone.

The trees should be carefully selected and poor ones never bought on account of their cheapness. The best are two or three year old buds or strong three year old native orange stock. The selection of varieties is of great importance, for different kinds bring different prices, but cost the same to plant. The varieties of oranges that have succeeded best in California so far, are Mediterranean Sweet, Riverside Navel, Maltese Blood, and Thin-skinned St. Michael. The best varieties of lemons planted here, are Lisbon and Eureka, and of limes the best is the Mexican.

Ten acres is enough for a citrus orchard, and one hundred trees, twenty feet apart, are planted to the acre. Oranges and lemons will bear freely at eight years old, and will be in full bearing at twelve years old, yielding then one thousand fruits per tree, per annum. Limes are in full bearing at five years old and are as profitable as oranges. The net profits from full bearing trees are $500 to $[,500 per acre.

The profits of orange culture may be shown by the following figures, carefully collated from the experience of prominent fruit growers in California. The estimates are low and abundant allowance has been made for errors and accidents.

The price obtained for the oranges in the above estimate is for common sorts. For the finer varieties already named $40 or $50 per 1,000 is generally obtained. The market is always good, and with our rapidly growing country and increasing wealth, it is not likely to fail.