160 



INDEX. 



Posterior commissure, 125 

 Posterior median seminal vesicle, 



19 



Posterior nares, 97 

 Posterior pal Hal nerve, 62 

 Potato cultures, 46, 47 

 Pouch, buccal, 17, 21 

 Prebronchial air-sac, 118 

 Primitive streak, 147, 148 

 Primordial utricle, 49 

 Processes ciliary, 126, 142 

 Pronephros, 145 

 Prosenchyraa, 82 

 Prosenchyma sclerotic, 8, 9 

 Prostomium, 14 

 Prothallium, 12 

 Protonema, 78 

 Proventriculus, 119, 122 

 Pseudopodia, 24, 25 

 Pteris aquiliua, 7 

 Pupil, 126, 142 

 Pyloric appendages, 114 

 Pylorus, 130 

 Pyramids, 141 

 Pyrenoids, 49 



Quill, 126 



Rachis, 127 

 Radial symmetry, 53 

 Radicle, 88, 89 

 Rami communicantes, 139 

 Rays medullary, 79 

 Receptacle, 85 

 Receptacles seminal, 14, 20 

 Rectal cceca, 119 

 Rectum, 65, 119 

 Rete mirabile, 114 

 Retina, 111, 126, 142 

 Rhizoids, 41, 75, 76 

 Rhizome, 7, 8, 9, 10 

 Rings annual, 79 

 Root, 7, 82, 92, 93, 94 

 Root-cap, 82 

 Root-hair, 82 

 Root-sheath, 89 

 Rosettes, ciliated, 19 



Rotation, 29 



Sacs scrotal, 128, 138 

 Sartorius muscle, 111 

 Scale, 6 

 Scales, 15 

 Scaphognathite, 73 

 Scapus, 126 

 Sciatic nerve, 110 



plexus, 110, 124 

 Sclerenchyma, 8 

 Sclerotic coat, 111, 126, 142 



parenchyma, 7, 9 



prosenchyma, 8, 9 

 Scrotal sacs, 128, 138 

 Scutellum, 89 



Sedgwick and Wilson, 19, 22, 36 

 Seed-coats, 87, 89 

 Seeds, 87 



Segmentation stages, frog, 143 

 Semilunar valves, 137 

 Seminal receptacles, 14, 20 



vesicles, 16, 19 



vesicle, anterior median, 19 



vesicle, posterior median, 19 

 Sepals, 85 

 Septal nerves, 21 

 Septum, 137 

 Serial symmetry, 141 

 Seta, 14, 77 

 Seta-sac, 22 



Sexual generation, 12, 75 

 Shaft, 127 

 Sheath, 34 

 Sieve-tubes, 9, 81 

 Sinus, pericardial, 68 



terminalis, 149 



venosus, 100, 102, 115, 145 

 Skeleton endophragmal, 72 

 Somites, 13 



Somites mesoblastic, 148 

 Sorus, 7, 11 



Spaces, intercellular, 84, 90 

 Spermatozoa, 19 

 Spermatozoid, 12 

 Spinal cord, 108, 109 



ganglia, 149 



