27 



LECTURE III. 



The Ovum or Egg Of Development Interstitial Chan- 

 nels Vessels Structures and Organs Alimentary 

 Canal Glands for producing Solvent Fluids The 

 Blood for Nutrition The Lungs for Respiration 

 The Liver for making Bile and Sugar, and altering 

 the Blood The Kidneys for forming and separating 

 Excrementitious Matter Cutaneous Glands for Se- 

 creting ^Temporary Structures for use while the Per- 

 manent Organs are being formed Skeleton The 

 Nervous System The Muscular System The 

 lAiYibs The Skin with Touch Organs The Tongue 

 The Nose The Ear The Eye. 



44. The Ovum or Egg. The contents of the bird's 

 egg are not directly converted into the tissues of the 

 chick, but probably more than nine hundred and ninety- 

 nine thousandths of the egg of the bird consist of 

 pabulum upon which the developing embryo is to live. 

 These constituents of the yolk, as well as the albumen 

 or white of the egg, are taken up and changed by the 

 nmmte speck of bioplasm which is the germ of the 

 growing chick, just as food is taken up and appro- 

 priated by other forms of living bioplasm ( 40). 

 As soon as vessels are developed, these substances 

 are taken up by bioplasm, just as pabulum from 

 the intestinal canal in after life, and converted into 

 blood. From this blood the various substances out 

 of which the tissues are formed are taken. The won- 

 derful growing point or spot which though so minute 

 is the most important part of the egg, can always be 

 seen if the egg be placed on its side and a portion of 

 the uppermost part of the shell be carefully removed. 



