Summary

Joseph P. Bradley Gallagher v. Jones — Opinion of the Court

The effect would be to give to the broker the control of the stock, subject only to nominal damages. The real injury sustained by the principal consists not merely in the assumption of control over the stock, but in the sale of it at an unfavorable time, and for an unfavorable price. Other goods wrongfully converted are generally supposed to have a fixed market value at which they can be replaced at any time; and hence, with regard to them, the ordinary measure of damages is their value at the time of conversion, or, in case of sale and purchase, at the time fixed for their delivery.
Source: Wikisource

Joseph P. Bradley Gallagher v. Jones — Opinion of the Court

A broker is but an agent, and is bound to follow the directions of his principal, or give notice that he declines to continue the agency. In the absence of a special agreement to the contrary, it is the principal's judgment, and not his, that is to control in the purchase and sale of stocks. The latter did not sak for any further advances by the order in question; he only directed a conversion or change of one stock into another. The plaintiff should have given prompt notice that he objected, and declined to make the change.
Source: Wikisource

Joseph P. Bradley Gallagher v. Jones — Opinion of the Court

It has been assumed, in the consideration of the case, that the measure of damages in stock transactions of this kind is the highest intermediate value reached by the stock between the time of the wrongful act complained of and a reasonable time thereafter, to be allowed to the party injured to place himself in the position he would have been in had not his rights been violated. This rule is most frequently exemplified in the wrongful conversion by one person of stocks belonging to another.
Source: Wikisource

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