The CHIEF JUSTICE said, that in certain cases allowances were made for loss of time, and the question here was, how far the present case came within the rules of those allowances. As a general principle, allowances to witnesses for loss of time could not be maintained. No doubt it was a great inconvenience, that individuals whose business required their whole time should be obliged to devote part of that time to the concerns of others without reward; but it was an inconvenience to which all were equally subject in turn; and as it was to answer the ends of public justice, it ought to be borne. As to allowance for loss of time, he considered the thing decided by the case of _Willis_ v. _Peckkan_ (4th _Moore_). An action had been brought in that case to recover 3_l._ for loss of time whilst giving evidence in a case. It was contended for the defendants that no such action could be maintained, except by medical men and attornies. The court was of the same opinion; but the jury, nevertheless, found a verdict for the plaintiff. In the following term a motion was made to have the verdict set aside and a nonsuit entered. The court, after hearing the arguments on both sides, decided that a nonsuit must be entered; and further held, that only medical men and attornies could charge for loss of time, as witnesses. The matter was settled, before, in the Court of King’s Bench, in the case of “_Moore_ v. _Adam_.” The court were therefore of opinion, that as far as this allowance for loss of time, the taxation should be reviewed. Mr. Sergeant _Lens_ then proceeded to other parts of the rule, and contended that the apportioning of the costs between the Phœnix and Imperial Insurance was the fairest mode which could be adopted, as each had two actions, though they were not all tried, and the evidence in each was the same. The _Chief Justice_ asked how much the expense of the experiments made amounted to. The Prothonotary said that all the items were so mixed up, that it would be impossible to ascertain at that moment. The _Chief Justice_—It is important that the charge for experiments should be known. The opinion of men of science is received as evidence, because it arises from pre-existing science; but surely, as in the present case, they ought not to acquire their knowledge at the expense of the parties against whom their evidence is to weigh.