4 8 



INDEX 



Mesentery, 41 



dorsal, 30 



ventral, 30 

 Mesoblast, 18 

 Mesoblastic somites, 15, 20 

 Mesoderm, 18, 20 

 Mesonephric duct, 26 

 Metaphase, 2, 6, 7 

 Metencephalon, 28 

 Mid-brain, 16, 17, 21, 32 



-piece, 3 - 



Milk ridge, 33 

 Minor omentum, 36 

 Mitosis, 3 

 Monad, 7 

 Muscle-plate, 25 

 Muscular segment, 33 

 Myelencephalon, 28 

 Myelon, 17 

 Myocardium, 19, 26 

 Myotome, 25 * 



Nephrotome, 20, 26 

 Nerve, maxillary, 35 



ninth, 35 



spinal accessory, 34, 35 



vagus, 35 

 Neural groove, 15 



plates, 15 



tube, 1 6, 17 

 Neuromores, 34 

 Ninth nerve, 35 



Notochord, 15, 17, 20, 21, 23, 34 

 Nuchal flexure, 28 

 Nuclear membrane, i 

 Nucleolus, i 

 Nucleus, i, 2, 8, 9 



of Pander, 13 



(Esophagus, 32, 35, 43 

 Olfactory pit, 28, 33 

 Oocyte, 7 



Optic cup, 22, 32 



stalk, 23, 29, 34, 35 

 vesicles, 16, 19, 22, 23, 29 



Oral pit, 23 



Ostium tubae abdominale, 37 



Otocyst, 34 



Ovaries, 4, 38, 40 



Ovary of cat, 4 



Oviduct, 37 



Ovum, formation of, 4 



Pancreas, 41 

 Pancreatic duct, 41 

 Pericardium, 42 

 Peripheral cleavage, 9 

 Petrosal ganglion, 35 

 Pharynx, 20, 25, 35 

 Pig embryo, ten millimeter, trans- 

 verse sections, 34 



whole, 32 



dissection of, 39 

 Polar body, 7 



Posterior cardinal vein, 25, 26 

 Pregnant uterus, 39 

 Primitive streak, 16, 17, 21, 23 

 Pronucleus, 7, 8 

 Prophases, 2 

 Pulmonary arteries, 42 



veins, 43 



Raw egg, 12 



Reconstructions of circulatory sys- 

 tem of chick of thirty- 

 three to thirty-six hours' 

 incubation, 21 



of circulatory system of chick 

 of forty-four to forty- 

 eight hours' incubation, 27 

 of central nervous system of 

 chick of forty-four to forty- 

 eight hours' incubation, 27 



