DIATOMS ill 



Triceratium favus (Fig. 31) follows, and is 

 from an amplification of 1,375 diameters. 



The next illustration (Fig. 32) is that of 

 Triceratium favus, var. Septangulatum, and is 

 from an amplification of 640 diameters. 



The last illustration (Fig. 4) of the diatom 

 series is from a photo-micrograph of 1,750 

 diameters. Only a small portion of this diatom 

 is seen. It is that of Coscinodiscus bi-angulatus. 



That there are thousands of markings on the 

 surface of any one of these diatoms is evident. 

 If we try to realise this fact and that several 

 diatoms are so small that we can barely see 

 them, while many are completely below the 

 powers of the strongest eyes we shall have 

 something that will test our thinking-powers, 

 and that may induce us to take a deeper 

 interest in Nature-study. 



