IN reviews of the evidence for mammalian fertilization in vitro, Austin and Bishop¹ stated that “it seems best for the present to regard the case as sub judice”. Chang² concluded that “up till now we still do not have a repeatable procedure to fertilize mammalian eggs in vitro”. Since the recognition of ‘capacitation’ of spermatozoa in the female tract by Chang³ and Austin⁴, Thibault and his associates^5–7 have reported cytological evidences of fertilization of rabbit ova in vitro by capacitated sperms. It was thought that unless living young are obtained by transplanting such fertilized ova into recipient rabbits, fertilization in vitro, as determined by cytological evidences, may not be sufficiently proved because such ova may be abnormally and/or incompletely fertilized, may die during the process, or may not be fertilized at all. This note reports a procedure to fertilize rabbit ova in vitro and the probability of normal development in vivo of such in vitro fertilized rabbit ova.