13. That the Worms give no light, when irritated, but if they do, the light lasts but a very little time, whereas that which appears in those, that were not angred before, continues a great while; the _Observer_ affirming to have kept of it above 2 hours. So far the _Journal des Scavans_; which intimates withal, that if the _Observers_ had had better _Microscopes_, they could have better examin'd this matter. But since the curious here in _England_ are so well furnish with good ones, 'tis hoped, that they will employ some of them for further and more minute Observations of these Worms; it being a matter, which, joyned with other Observations, already made by some excellent persons here, (especially Mr. _Boyle_) upon this subject of Light, may prove very luciferous to the doctrine of it, so much yet in the dark. * * * * * _Some Observations of the Effects of _Touch_ and _Friction_._ The Operations and Effects of _Touch_ and _Friction_ having been lately much taken notice off, and being lookt upon by some, as a great _Medical_ Branch, for the curing of many diseases and infirmities; it will perhaps not be unseasonable to mention (here also) some Observations relating thereunto; which may give an occasion to others, to consider this subject more, than has been done heretofore, and to make {207} further Observations and Tryals concerning the power of the same. And _First_, the Illustrious Lord of _Verulam_, in his _History of Life and Death_, Histor. 6. Sec.. 3. observes, That _Motion_ and _Warmth_ (of which two, _Friction_ consists) draws forth, into the parts, New Juyce and Vigour. And _Canon._ XIII. he affirms, That _Frictions_ conduce much to _Longevity_. See the same, _Connex._ ix. Sec.. 26. &c.