CHAPTER XIV. 
THE CIRCULATION OF THE BLOOD AND THE DORSAL VESSEL. 
1. THE CIRCULATION IN INSECTS GENERALLY. 
THE circulation of the blood is maintained by the pulsations of 
the abdominal or ventricular portion of the dorsal vessel. Its 
anterior or thoracic portion conveys the circulating fluid to the 
head ; the blood is there poured into numerous sinuses between 
the various organs, and returns by the great ventral sinuses 
to the abdomen, and, after bathing and nourishing the organs 
of the body, passes again into the ventricular part of the dorsal 
vessel. The relations of the blood sinuses and the tracheal 
vessels have been already alluded to (p. 367). 
Historical Although Swammerdam [4] and Malpighi [148] 
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