The class-book of anatomy : designed for schools, explanatory of the first principles of human mechanism, as the basis of physical education . s, are in each, a row of glands, equivalent to 228 ANATOMICAL CLASS BOOK. bags, smaller than pin heads, which ooze out an oilysecretion, to prevent the adhesion of them together, as issometimes the case when the pyes are much such manifest provision for contingencies, is anotherbeautiful illustration of super-human contrivance. Explanation of Fig. 89. This plan exhibits the naturalsize of the passages of the tears. a Is the lachrymal gla
The class-book of anatomy : designed for schools, explanatory of the first principles of human mechanism, as the basis of physical education . s, are in each, a row of glands, equivalent to 228 ANATOMICAL CLASS BOOK. bags, smaller than pin heads, which ooze out an oilysecretion, to prevent the adhesion of them together, as issometimes the case when the pyes are much such manifest provision for contingencies, is anotherbeautiful illustration of super-human contrivance. Explanation of Fig. 89. This plan exhibits the naturalsize of the passages of the tears. a Is the lachrymal gland, ororgan that secretes the tears;showing its natural situation,with respect to the eyelids. bb. The eyelids widely opened. c. The situation of the punc-ta laehrymalia,or the holes atthe inner angles of the lids,through which the tears flow,to get into the tube whichfinally conveys the fluid to thenose. dd. The ducts continued fromthe pun eta laehrymalia. ee. The angles which theducts form after leaving The termination of the lachrymal ducts in The lachrymal The nasal duct, continur/l from the lachrymal WHY DO AGED PERSONS REQUIRE CONVEX GLASSES! Age gradually relaxes the tension of the whole system ;the eye, therefore, suffers in a corresponding ratio. Thecornea becomes less prominent : —the convexity of thelens is also diminished, and the rays of light are conse-quently less convergent than formerly. The picture ofthe object is faint, because the rays have a tendency, bytheir divergency, to impinge at a supposable plane, be-yond the retina. ANATOMICAL CLASS 90. 229
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Keywords: ., bookcentury1800, bookdecade1830, booksubjectanatomy, bookyear1834
