LESSONS FROM THE MICROSCOPE. 99 



constructed to aid us in seeing things which are too 

 small for us to see without this apparatus is the 

 microscope. Its structure and principles upon which 

 it operates, can not here be explained. Let it be 

 sufficient to say that the microscope is a combina- 

 tion of glass lenses so arranged as to make things 

 seen through it much lai-ger. If you take your 

 grandmother's spectacles and hold them just right, 

 objects seen through the glasses will appear larger. 

 In a similar way and for a similar purpose the glasses, 

 or lenses, of a microscope are used, only that the 

 microscope makes a much greater difference in the 

 apparent and real size of objects seen through it. 



MICROSCOPIC STRUCTURE OF THE TISSUES. 



As the minute scales of the butterfly 

 scope as an can n t be satisfactorily examined with- 

 Ajd m ou ^ ^ Q m i crO scope, so the proper and 



successful study of the different tissues 

 of the body requires the aid of this instrument. And 

 since it is not possible for all pupils to have access 

 to a microscope, it is fortunate that those who have 

 made physiology a careful study, and have examined 

 the various structures and tissues with great care, 

 have made drawings and sketches which we may 

 study. Thus we have here on the Aid a series of 

 marvelous paintings, true to nature, which we can 

 study with even more satisfaction than if we were to 

 prepare the specimens and look at them through the 

 microscope ourselves, We have spoken of the body 



