22 MINUTE MARVELS OF NATURE 



As an instance of the revealing power of the 

 microscope. I will again call my readers' attention 

 to Fig. 4, and ask that it may be compared with 

 Fig. to, which represents the central portion 

 of the same group still more highly magnified, 

 showing how further details of structure are 

 brought out by the increased magnifying power. 

 And again in Fig. 1 1 a few forms selected, but 

 rearranged, from the centre of Fig. 10, are shown 

 under considerably greater magnifying power. 



Fig. 12 shows another combination immensely 

 magnified from the top central edge of Fig. 4 

 group, the members of which can readily be 

 identified by their relative positions. These will 

 serve to give an idea of the beautiful and wonderful 

 frustules or shells of diatoms. 



It may occur to those who study these illustra- 

 tions how beautifully these diatom shields stand 

 apart in the groups, or how prettily they are 

 arranged. It is true that they have been arranged 

 in these forms. Here we get an instance of 

 man's skill with the minute, for all these 

 diatoms have been individually selected as per- 

 fect forms, and carefully placed in their relative 

 positions. ^ 



Fig. 1 3 shows a beautiful group of diatom Valves, 

 arranged in a symmetrical and artistic manner 

 by one skilled in this work. The actual group 



