364 Copeland . — The Mechanism of Stomata . 
Fig. 38. Angiopteris, sp: Cross section, x j6o. 
Fig. 39. „ „ Section across end. x J60. 
Fig. 40. Dennstaedtia punctilobula , Bernh. Surface, x 510. 
Fig. 41. „ „ „ Cross section, x 1020. 
Fig. 42. Azolla Caroliniana , Willd. Surface, x 1020. 
Fig. 43. „ „ „ Cross section, x 1020. 
Fig. 44. Lycopodium lucidulum , Mx. Cross section, x 700. 
Fig. 45. Equisetum arvense , L. Surface, x 510. 
Fig. 46. „ „ Cross section, x 510. 
Fig. 47. Disporum lanuginosa. Surface, x 700. The main focus is below 
the stoma. 
Fig. 48, Oxydendrum arboreum , DC. Surface, x 1020. 
Fig. 49. ,, „ Cross section, x 1020. 
Fig. 50. ,, „ Section across end. x 1020. 
Fig. 51. ,, ,, Longitudinal section, x 1020. 
Fig. 52. Azalia nudijlora, L. Surface, x 1020. 
Fig. 53. „ ,, Cross section, x 1020. 
Fig. 54. Ipomoea hederacea , Jacq. Surface, x 760. 
Fig. 55. „ ,, „ Cross section, x 760. 
Fig. 56. Phlox divaricata, L. Surface, x 760. The focus is near the outer 
wall. 
Fig. 57. Gentiana Andrew sii, Griseb. Surface, x 760. 
