“…The different pollination requirements of the varieties in question suggest that the former is the factor responsible for the differential response of cuttings of these varieties to identical concentrations of IBA. The Adriatic, Kadota, and Mission varieties all set their fruits parthenocarpically, while cross-pollination and fertilization are essential for fruit setting in the Calimyrna variety, unless a hormone is applied externally (1, 3). The same relationship of auxin content to fruit setting in the fig appears to exist, as has been reported by GUSTAFSON (6) for oranges, lemons, and grapes in which the auxin con-…”