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cause_n body_n part_n whole_a 3,651 5 5.0534 4 true
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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A62018 Ephemeri vita, or, The natural history and anatomy of the Ephemeron, a fly that lives but five hours written originally in Low-Dutch by Jo. Swammerdam ...; Ephemeri vita. English Swammerdam, Jan, 1637-1680.; Tyson, Edward, 1650-1708. 1681 (1681) Wing S6233; ESTC R3239 37,691 72

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its Skin I believe the Lung-vessels also shed a Skin notwithstanding I have not yet seen it for at that time when I hapned to make these observations I knew not of it In the Silk-worms is this shedding of the Skin of the Lung-vessels so considerable that all humane understanding must stand amazed thereat for in that very small time when the Silk-worm sheddeth its Skin several hundreds of Air-vessels in its body also shed their Skins being very thin films all made up of those Rings before-mentioned which would seem incredible in the Relation if I my self had not seen it distinctly and had shewn it also to others The Colour of these Lung-vessels is a Pearl colour somewhat Grey which as they come to change their Skin changeth into a clear and shining White for which cause they are much Whiter in the Flies than in the Worms they spread throughout the whole body to Communicate Air to all the parts outwards and inwards so that those two great and remarkable Air-vessels which appear placed on each side of the Worm send to all parts of the body their Branches as in the Head to the Nerves and Brains in the Breast to the Muscles of the Legs and Wings in the Belly to the oblique and straight thread-like Muscles As also to the EEE Medulla Spinalis to FFF the Milt or Seed-vessels of the Male to GG the hairy Gills to the Stomach and Guts to III the outward Skin to KK the Film of the wings to the Egg-cluster in the Female to the Film MM that covereth the Egg-cluster to the Eggs as they are taken out of the body and to the heart I have had much trouble to discover the outward openings of the Lung-vessels for they open neither in the Mouth or Throat as in other Creatures and for that Reason they lessen gradually as they nearer approach the Head whereas otherwise they ought there to widen after a long search they seem to me to have their openings under and in the sides of the Breast almost in the same manner as I have afterwards observed it in Grashoppers where these openings are easier to be seen but here in our Worm by reason of its living in the Water and Clay are less and therefore more troublesome to discover In the Silk-worms these openings of the Air-vessels are more visible for they have Ten on each side of their body viz. Eighteen large ones and Two lesser which last not having any Brown spots are not so visible and never appear clearer to sight than when the Worm sheddeth its Skin when out of all these Twenty openings of these Air-vessels the shed Films thereof may be seen to issue out From these Observations appeareth very clearly the reason why our Worms rise higher into other Cells when the water of the River increaseth for that sometimes they must draw fresh Air and breath for which cause it may also be said that they follow the falling water lest they should be too much dryed up by the surrounding Air and that their vessels through the dripping out water might be in danger of closing These Lung-vessels are best discovered when the Worms have been dead for some days and that their inwards are become blackish for then they appear very clear to the sight which happens for that they they are of a Pearl colour and like new boil'd Silver and also for that through their stiff and hard matter of which they are made they are not so subject to rot for which reason also at that time they better keep their Figure and roundness When with a Microscope you view these Worms on their Breast and Belly the whole belly seemeth as interwoven with Silver-white vessels But now to know truly whether they contain Air in them lay them only in a drop of water and then close or press them with the point of a Needle whereby the inclosed Air will presently appear when these Creatures are Dissected under the water and that with fine Scissers you clip off some of their Lung-vessels they rise immediately to the Surface of the water which also do all the parts of the vessels broken off with their ends upwards in a dried Worm Dissected these Vessels are very easily discovered because by their curled-like Rings they remain constantly open how much soever the other parts dry up One of the most remarkable things observable in these Lung-vessels is the great number of them extending to the Gills where are three chief of them represented as cut off the middlemost is always black which notwithstanding just in the middle appeareth transparent White the other two appear on each side of the middlemost which is Black and they shoot out a great number of Silver white Vessels in the Gills which vessels are not very visible by their Colour by reason of the very bright appearance of the Gills which are in number Six on each side of the body and are pure shining White under the same on each side are the Five Finns of a Yellow Colour with which the Worm swimmeth R I had made some other Observations concerning the Gills and their Vessels which are missing and which I cannot now find and the Contents of them is wholly out of my Memory so that I remember not what is the use of that Feather-like hairy part which is seen under the first and uncut pair of Gills as also whether it is found under the other Gills what Communication those Gills have with the Lung-vessels and the Lung-vessels with the heart I know not so that I can relate no more thereof than what is represented in this Delineation where all the Air-vessels about the heart are not represented to prevent confusion only some are represented whole and the others as cut of I have also in all my delineations not observed an exact proportion as to the size of the parts for that seemed to me a too tedious labour and of small use so that I have delineated one part somewhat larger than the other never thinking to have made these my Observations publick till I had anew more examined them all over which I also afterwards found more necessary as well for the greater knowledge I afterwards attained concerning the parts of Insects and also a greater readiness in the Anatomizing of them but the kind Reader is desired to pardon what is wanting which I am conscious is very much and who is able in many years to describe this Insect and the wonders therein observable which is the reason that I Communicate it thus to the world the more for that I now am resolved to addict my thoughts more to love the Creator of these things than to admire him in his Creatures The heart appeareth placed above in the back as it is in Silk-worms the Worms of Bees Wood-worms Caterpillars and other like Insects here and there it appeareth somewhat swelling