1. Makino;Waxman, Arakaki, and Smith, 1967; Schlegel et al, 1966; Bowen and and Kerr, 1966; Stenchever, Hempel, and Macintyre, Makino, et al,;et al,1966
2. Edwards et a';Smith, McNab, and Ferguson-Smith,,1967
3. tors have now selected specimens for study and have It has been suggested that triploid specimens collected 267 chromosomally abnormal abortuses. tend to manifest as 'missed abortions',(19-1
4. ranged in age from about 30 to 63 days of develop-Judging by the literature, as well as our own mental age. There were 11 triploid embryos with a experience, tetraploidy is one fifth to one quarter as focal, external anomaly. Six of them had meningocommon as triploidy (Boue and Boue, 1970; Carr, myelocele, one had an encephalocele, and 4 had,1970
5. conceptuses with normal chromosomes,1965