GLIMPSES INTO PLANT STRUCTURE }^ 



celled alga;, known to botanists as Protococcus 

 tnridis. Fig. 21 shows a magnified photograph 

 of this green stuff off my finger-nail, under a 

 medium magnifying power, and reveals a con- 



Fig. 21. The green stain on damp fences, &c., is conii")Osed ot 

 myriads of microscopic plants 



glomeration of granules, each granule a plant. If 



we examine one of these green granules under 



very high magnifying powers, we find that it 



possesses considerable structural detail, simple, 



perhaps, compared with the structure of the higher 



plants ; but then it must be remembered that 



these tiny living plant-atoms occupy only about 



one-thousandth of an inch of space. 



c 



