This court has held that there are two kinds of interventions. To the onе class belong those cases in which the court or chanсellor to whom the application is made is not bound to рermit a third party to intervene, and load the case with collateral issues, and in which the allowance of an interventiоn is entirely discretionary with the chancellor. To the other class of cases belong those in which the right to intervene is absоlute, resting, as it does, upon the grounds of necessity, and the inability of the intervener to obtain such relief as he is entitled to by any оther means than an intervention. Minot v. Mastin,
