the things the medical profession thinks may be one of the causes of these nonunions, is it not?
“A. Yes, sir.
“Q. After you have had an established nonunion, Doctor, where the leg is gone three months or more and you have a very slight callus and a very slight bony union, in fact no bony union at all is shown here according to the evidence, the chances of getting bony union thereafter, except by operation, is wholly speculative?
“A. Most of the time, yes.
“Q. In other words, you would say, whether a cast was applied or splints or any of these different methods as outlined for treatment were used, after three months have gone by, whether you would get union is both speculative and conjectural, is it not ?
“A. Yes.
“Q. You may treat it one way and not get union?
“A. Yes.
“Q. And you may treat it another way for a while and still not get union ?
“A. Yes, I have done that.
“Q. And this particular injury here, at that time, July 5th or 12th, you would say from your observation of the case — from what you have seen and heard — that the chances of getting union from the application of a cast or splints or heat or any of these things you mentioned, the chances of getting union are both conjectural and speculative?
“A. Yes.
“Q. And where you have tried these things and you are not getting solid union, the operative method is the only ivay?
“A. Yes. Or leave it alone and wear a brace as some people do.”
Dr. Fortin further testified “after three months we know we have a nonunion or a delayed union.” Also, that he thought there would be a perfectly good union as a result of the operation.
In the complaint it is alleged, “that the said defendant in attempting to diagnose, treat, heal, set, attend, and cure the said injury did negligently and carelessly fail to diagnose the said injury correctly or at all, and negligently and carelessly failed to set said broken limb so that a jointure or connection was made of the broken bone and carelessly