n 



J J 



THE society's XOTE-BOOKS. 329 



Plate XII. 



Upper Portion. 



Illustrations of structure of wood of Finus Sylvest'ris. 



Fig. 1. — Portion of a transverse section showing parts of the rings of 

 growth ; pic. , pleurenchyma, or woody tibre ; prs. , pro- 

 senchyma, or wood cells ; /. c. , turpentine canal. 



2. — Vertical radial section, with " bordered pits," the so-called 

 glandular tissue ; mf, mf, portions of medullary rays. 



3. — Tangental section, showing cross section of the medullary 

 rays, and the bordered pits, as well as a large turpentine 

 canal, t. c. All x 100. 



Central Portion. 



Fig. 1. — Tongue of Trochus Crassus entire, as viewed with a low 

 power, X 10. 



,, 2. — Teeth of a single series, x 50. 



,, 3. — Shell of a species of Trochus to show its general character. 



Lower Portion. 



Fig. 1. — Illustrating the structure of injected human lung, a. c, a. c. , 

 air cells ; I. m., I. m., living membrane of air cells. 



,, 2. — Diagrammatic sketch of Spinal cord ; ccc, white matter ; d (/, 

 grey matter ; o, the posterior ; 6, the anterior median fissure ; 

 //, the anterior cornu or horn ; e e, the posterior cornu. 



Drawn by Tuflen West. 



J? 



Plate XIII. 



Fig. 1. — Larva of Lace Wing Fly, Chrysopa peiia. 



Drawn by A. Hammond. 



2. — Diagram of left hind foot, x 100. 



3. — Lace Wing Fly, perfect insect from " Our Insect Allies." 



4. — Figure of young Head Louse, Pediculus capitis, x 50. 



Drawn by Tuft'en West. 



,, 5. —Fragment of Tentacle, or muscular band of Physalia pelaqica, 

 X 50. 



,, (3. — Spherical cells containing stinging threads coiled up inside, 

 X 480. 



,, 7. — Spiral thread, with cells containing granules of a blue colour, 



X 480. 

 ,, 8. — Imperfect Spiral thread, with terminal of a brown colour, 



X 480. 



Many scattered cells will be seen in Muscular band also containing 

 stinging threads. Drawn by G. F. Chantrell. 



