| Description | ' Mr Henshaw read his Experiments of freezing, and was desired to adde more to them, and bring them in against next day.
Dr Wilkins suggested an Experiment of putting water, freed from are, into Mr Boyles Engine, and to lett it freeze there, to see, whether it will not bee a cleer Ice.
Dr Whistler suggested, that the freezing of salt water renders it fresh. And Mr Hill confirmd it, by alledging, that those of Amsterdam use frozen Sea water for Brewing.
Dr Powers paper of Subterraneous Experiments, and observations of the Damps of Colemines, was read; and it was orderd, that thanks should bee returned to him by Dr Croone, from the Society,
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Here it was mentioned, that there were some other Experiments formerly recommended to Dr Power, and that it was desirable, to have them also tryd by him, at his conveniency: viz: 1 of letting downe a bladder gently distended to see, whether it grow more or lesse flaccid above ground or below. 2. Of the subsiding of [sign for quicksilver?] in the Torricellian Experiment under ground, and observing the differences at severall depths. 3. Of trying in the deepest pit, in how many vibrations of a pendulum of 2 ½ inches long or so, a noyse heard at bottome, is heard at top.
Sir Robert Moray's account of an Echo in Scotland was read, and his offer of having it more fully inquired into, and more exactly described, was accepted.
Mr Barrow should be desired to bring in an Account of an Echo at Cambridge.
Mr Haak his paper of Colchester Oysters was read and orderd to bee Registerd: upon which Dr Merrett suggested, that it should be inquired into, whether Oysters doe not Spawn at different times and in different places, as also, whether they doe not differ in Sexe; it being observed, that some fo them, counted to be females, are all white, casting forth a kind of a spittle, others esteemed to bee males, to have a black spot, and not to spit. Hee mentioned likewise, that the age of Oysters was knowne by the thicknesse and friablenesse of their shells. Hee was desired to bring in his observations on this subject. Hee was also put in minde of his observations upon Wines, and likewise of the way of making and colouring all sorts of Earthen Vessells.
Hee also produced his [crossed out -illegible] Catalogue of the Naturall things of England, and of the rareties thereof: which he was desired to Compleate, and to communicate to the Society.
Mr Hooke made the Experiment of weighing rarefied and common Aire, in little glasse bubbles, and the difference was found to bee nere 1/7 a graine in one of them, and above ½ a graine in another.
Hee also brought in an account about measureing the expenasion of the Aire, viz: what proportion the decrease of its force holds to its increqse of dimension: the reading therof was differed till next day.
The same proposed against Next day, the Experiment of weighing ascending and descending Bodies in water, viz what weight they adde to the vessel containing the water.
He was also desired, to prepare for the making of the Experiment of water freed from aire, which mr Zulichem saith, descend not in the Cane, afte the Aire is exhausted out of the Receiver.
Dr Goddard was desired to make Linus's Experiment, mentioned in the same Letter; viz, of the fingers sticking close to the Tube with both ends open and shorter then 29 ½ inches. '
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