(988)
Of their Internal parts, he observes the quality of the humor, found in them, viz., concreting by the warmth of on's hand, and leaving a cruft: next, the mucous and rosy-color'd skin, suppos'd to be the new skin. found under the exterior. Then he describes the various Muscles, and Fibres, both parallel, and oblique, more or less, together with the insertion of the Fibres in every Ring, and of:very Ring in the Cavity of its neighbouring Ring, for producing the Progressive Motion of the Animal; the manner of which is described very particularly.
He passes on to the Vessels moistening all the parts, observing their branches and anastomoses; their termination in one common trunck, and the curious net-work they make. These vessels prolonged, he makes to be the Lungs, whose structure for Respiration he diligently describes, illustrating the same with Observations made of other Insects, and with some Trialls shewing, both that Air issues out of their body, and that Oily liquors will suffocate them, upon the Accompt only of stopping the orifice of their Wind-pipe, He inquires also, Whether the Motion of the Abdomen be necessary in these Infects for Respiration, and seems to incline to the Affirmative.
From the Lungs he goes on to the Heart, which he saith reaches from the head to the taile, being of a strange figure, and rather many hearts, than one; whose motion of Systole and Diastole he describes, taking also notice, how the Vitall humor passes from one little heart to another.
The Ventricle he observes to reach also from one extreame of the Worm to the other; describing its substance, shape, fibres, and vessels bedewing it, together with its resemblance to the Ventricle of other Insects: where he particularly notes the great voracity of the Silk-worm, affirming, that it will eat as much in one day, as its whole empty body weighs.
In the sides of the Belly about the Ventricle he finds a Woof of Vessels, containing the Silky Juyce; describing their progress from the mouth downward into the belly, and their strange flexures and meanders; whose end he affirmes to have at length, after along and patient search, found out. Of these Vessels he makes a large and curious description, as also of their different Juyces, as the cause of the different forts of Webbs and Baggs.
