| It has already been stated that both parthenogenesis and gemmation are ultimately derived from sexual reproduction. |
| Machinery Hall has illustrated, from its earliest days, the process of development by gemmation. |
| The process of mould growth on indoor surfaces generally includes gemmation, growth, and sporulation. |
| In some other cases medusoid develops directly from medusoid, whether by sexual cells or by gemmation. |
| However, in such a way of reproduction, gemmation of descendants causes involution of parental tissues as before. |
| In the next group the gemmation takes a spiral bias, producing the nautilus shape which misled the earlier naturalists. |
