296 EMBRYOLOGY AND CLASSIFICATION. 



CHAPTER XVI. 



EMBRYOLOGY AND CLASSIFICATION. 



THE investigation of the structure and gradual 

 growth of the ovarian egg is so laborious that 

 it will be many years before we can hope to 

 have a complete picture of all its phases. The 

 apparatus required for the task is very compli- 

 cated, and a long training is necessary merely 

 to prepare the student for the use of his instru- 

 ments. A superficial familiarity with the mi- 

 croscope gives no idea of the exhausting kind 

 of labor which the naturalist must undergo 

 who would make an intimate microscopic study 

 of these minute living spheres. The glance at 

 the moon, or at Jupiter's satellites, which the 

 chance visitor at an observatory is allowed to 

 take through the gigantic telescope, reveals to 

 him nothing of the intense concentrated watch- 

 ing by which the observer wins his higher re- 

 ward. The nightly vision of the astronomer, 

 revealing myriad worlds in the vague nebulous, 

 spaces of heaven, is not for him ; he must take 

 the great results of astronomy for granted, si 



