PLATE I. 





SWARMSPORES AND ZYGOSPORES. 



FORMS OF CHLOROPHYLL-BODIES. 



a — d Development of swarmspores in the tubular cells of Vaucheria clavata. 



e — h Swarmspores and resting-cells of "red-snow" (Spkaerella nivalis), mixed 

 with pollen-grains of Pines. 



i — k Forms of Chlorophyll in cells of Desmidieae (i. Closterium Leibleinii ; 

 k. Penium interrupium). 



1 Formation of zygospores and spiral arrangement of Chlorophyll-bodies 

 in cells of Spirogyra areta. 



m Star-shaped Chlorophyll-bodies in cells of Zygnaema pedinatum. 



n — o Gloeocapsa sanguined. 



p Protonema of ScMstostega osmundacea. 



q Transverse section of the foliage-leaf of Summer Savory (Satureja hortensis). 



r Transverse section of the leaf of the Passion-flower. 



s Relative positions of laticiferous tubes and palisade cells in the leaf 



of a Spurge (Euphorbia Myrsinites). 



All the figures greatly magnified. 



