THE SICKLES CASE. – The second week of this very important trial is over, and there is still no immediate prospect of its conclusion. When the cause was commenced there was a general impression that its hearing would be concluded in a week or ten days, and that it was pre-judged to a great extent. But we find, on the contrary, that every step is closely contested by counsel on both sides. Indeed, so strong is the personal feeling, that counsel of proverbial coolness have lost their tempers and engaged in bitter wordy wars, hardly suited, as the Court remarked, to the dignity of the profession. It must be remembered, however, that the case is rather a remarkable one in its personal aspect. A new District Attorney is trying a lawyer for killing another lawyer, and he the predecessor of the prosecutor. The Washington lawyers are straining every nerve to justify the memory of their former confrere; while the New York lawyers are the intimate personal friends of the prisoner at the bar. So, for the last three or four days, the trial has been one of skill between the lawyers, while the Court, jury, prisoner, and, indeed, the country at large, look on the proceedings as the audience in a gymnasium might regard a lengthened contest between eminent masters of the fence. From the questions of law and fact already raised the case has assumed an aspect of the deepest importance. It is so regarded throughout the Union, and both lawyers and layman are deeply interested in the precedents which it will establish. We should not be surprised to see new evidence introduced and new issues raised; so that the trial might last two weeks longer.