| (a) | - | if such sentence is severer in kind than the sentence which such convict was undergoing when he escaped, the new sentence shall take effect immediately ; |
| (b) | - | if such sentence is not severer in kind than the sentence which such convict was undergoing when he escaped, the new sentence shall take effect after he has suffered imprisonment for a further period equal to that which, at the time of his escape, remained unexpired of his former sentence. |