SYSTEMATIC SYNTHESIS OF TISSUES INTO ORGANS. 307 



the means for adjusting them are imperfect. When this 

 occurs in youth, as it sometimes does, an effort should 

 be made to bring into action the adjusting means, by 

 looking at near objects. When long sight is the result 

 of age, sight can only be assisted by convex glasses. 



834. SHORT SIGHT is PRODUCED either by too convex 

 media or imperfect means of adjustment. 



835. Remark. THE FREQUENCY OF SHORT SIGHT IN CHILDREN can 

 be accounted for, if it is remembered that as the eye grows one part 

 may change its form and size more rapidly than another, and the media 

 of the small eye are of course more convex than those of the large one 

 ought to be. 



836. Inf. CHILDREN AND YOUTH should accustom themselves and 

 be directed to read, and look at objects, at different distances, and, if 

 growing near-sighted, much pains should be taken to often exert the eye 

 in looking at the most distant objects that can be discerned. 



837. SHORT SIGHT, DEPENDENT ON TOO GREAT CON- 

 VEXITY OF THE MEDIA, can be assisted only by wearing 

 concave glasses, which should be carefully adjusted, and 

 a little weaker rather than stronger than is essential for 

 clear sight, and used only when necessary. 



838. Remark. Do not let any near-sighted child or youth grow up 

 without enjoying the assistance of glasses in viewing nature. Often a 

 person is to a degree near-sighted, and is not aware of it, losing all the 

 delight conferable by the magnificence of the starry heavens and the 

 widespread beauty of Nature. 



839. ARTIFICIAL LIGHT should be of the same kinds, 

 and as nearly as possible in the same proportions, as in 

 sunlight; should be abundant, diffused, and come from 

 above the eye. 



840. Remark. LARD gives the best light, "gas" next best, of 

 ordinary materials ; wax gives a beautiful light, but is too costly. STU- 

 DENTS SHOULD RATHER CLUB THEIR MEANS, and secure a brilliant light, 

 than separately use an inferior one. LIGHTS SHOULD NOT BE SHADED, so 

 as to make a bright light before the eyes and darkness elsewhere, as the 

 eye must change too suddenly when directed from one object to another. 



884. How ? 835. What said ? 836. How treat the eyes of ? 837. What said 

 of - ? 838. Should glasses be used ? 839. What said of ? 840. What said of ? 



