Section 17. No Shareholder to sell any share on which any call is unpaid

17. No Shareholder to sell any share on which any call is unpaid. 18, 19. Transferred of share may require a memorial of transfer to be filed, and Supreme Court may order memorial, &c. and (19) no transfer to be complete, &c. until memorial is filed, &c. 20. Supreme Court may order memorial to be corrected, &c. 21. Directors may close the Register of transfers for a period.