Chambers's encyclopaedia; a dictionary of universal knowledge for the people . while in the latter case, it is probablyassociated with disease of structure. It is unnecessary to describethe treatment, which varies according to the peculiarity of eachindividual case, and must be left solely in the hands of thephysician. APHELION, that point in the elliptical orbit of a planet whichis most remote from the sun. The opposite point, or that nearest 234 APHIS—APHRODITE. to the sun, is styled the Perihelion. At the former jjoint, theswiftness of the planets motion is least, and begins to increase;at
Chambers's encyclopaedia; a dictionary of universal knowledge for the people . while in the latter case, it is probablyassociated with disease of structure. It is unnecessary to describethe treatment, which varies according to the peculiarity of eachindividual case, and must be left solely in the hands of thephysician. APHELION, that point in the elliptical orbit of a planet whichis most remote from the sun. The opposite point, or that nearest 234 APHIS—APHRODITE. to the sun, is styled the Perihelion. At the former jjoint, theswiftness of the planets motion is least, and begins to increase;at the latter, it is greatest, and begins to decrease. Tliis irregu-larity of motion is most remarkable in comets whose orbits devi-ate most from the circle. Tlie motion of tlie comet of 1680, at itsperilielion, was calculated as 137,00a tiuies more rapid than itsmotion in A. See Apsides. APHIS, a genus of insects belonging to tlie order Hemiptera,sub-order Homoptera—tlie type of a family called Aijhidii. Theyare small insects, living by sucking the juices of plants, upon. Apple Aphis {Eriosoma Mali): tt, wingiess insect, magnitiud; A, winglcsp insect in excrescence of ttie tree, magnified. which they maj be seen congregated in immense numbers, oftendoing serious injury, causing tlie distortion of leaves, and even thebliglit and decay of tlie plant. The woolly Apliis, or AmericanBlight (A. lanigera; Eriosoma Mali of Leacli), is sometimes veryinjurious to apple-trees, and wlien once it lins found its way intoa garden or orchard, it is very difficult of removal. It is a minute
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