with impunity. Prompted by high motives, Tyndall LITTLE tended too much to disregard the protests of his body. JOURNEYS Over-application in Germany caused at one time absolute sleeplessness for, I think he told me, more than a week; and this, with kindred transgressions, brought on that insomnia by which his after-life was troubled, and by which his power for work was diminished; for, as I have heard him say, a sound night's sleep was followed by a marked exaltation of faculty.

And then, in later life, came the daring which, by its results, brought his active career to a close. He conscientiously desired to fulfill an engagement to lecture at the British Institution, and was not deterred by fear of consequences. He gave the lecture, notwithstanding the protest which for days before his system had been making. The result was a serious illness, threatening, as he thought at one time, a fatal result; and notwithstanding a year's furlough for the recovery of health, he was eventually obliged to resign his position. But for this defiance of nature there might have been many more years of scientific exploration, pleasurable to himself and beneficial to others; and he might have escaped that invalid life which for a long time he had to bear.

In his case, however, the penalties of invalid life had great mitigations-mitigations such as fall to the lot of few. It is conceivable that the physical discomforts and mental weariness which ill-health brings may be almost compensated, if not even quite compensated, by the pleasurable emotions caused by unflagging attentions and sympathetic companionship. If this ever happens, it happened in his case. All who have known the household during these years of nursing are aware of the unmeasured kindness he has received without ceasing. I happen to have had special evidence of this devotion on the one side and gratitude on the other,

LITTLE which I do not think I am called upon to keep to myJOURNEYS self, but rather to do the contrary. In a letter I received from him some half-dozen years ago, referring,

among other things, to Mrs. Tyndall's self-sacrificing care of him, he wrote: "She has raised my ideal of the possibilities of human nature."