Template:Pearce1903 table1
From Embryology
| Number | Source | Length | Age (probable) |
| 1. | Prof. Mall (No. 22, Baltimore | length 20 mm. | probable age 47 days |
| 2. | Prof. Mall (No 45, Baltimore | 28 | 58 |
| 3. | Dr. Longcope, Philadelphia | 54 | 73 |
| 4. | Dr. Longcope, Philadelphia | 60 | 73 |
| 5. | Prof. Mall (No. 44), Baltimore | 70 | 84 |
| 6. | Prof. Mall (No. 23), Baltimore | 70 | 84 |
| 7. | Prof. Mall (No 34, Baltimore | 80 | 89 |
| 8. | Marchand, Leipzig | 90 | 94 |
| 9. | Prof. Mall , Baltimore | 94 | 97 |
| 10. | Marchand, Leipzig | no measurement | supposed 3 months |
| 11. | Dr. Longcope, Philadelphia | 115 | 115 |
| 12. | Prof. Mall, Baltimore | 116 | 116 |
| 13. | Dr. Longcope, Philadelphia | 127 | 127 |
| 14. | Prof. Ma1l (No. 48), Baltimore | 130 | 130 |
| 15. | Dr. Longcope, Philadelphia | 145 | 145 |
| 16. | Dr. Longcope, Philadelphia | 160 | 160 |
| 17. | Dr. Longcope, Philadelphia 160 | 160 | |
| 18. | Prof. Mall, Baltimore | 170 | 170 |
| 19. | Dr. Longcope, Philadelphia | 200 | 200 |
| 20. | Prof. Mall, Baltimore | 205 | 205 |
| 21. | Marchand, Leipzig | 210 | 210 |
