APPLE CKnWIN., IN CALIFORNIA. 



41 



le... 



i 



U. U 



_ ..... 



. ...... ........ .,.... 



*t- 4- 4 '4. 

 *.%.&. 4. 



<L a. 4. 4. 



Fig. 20. "The square system. 

 (After Lelong) 



i H. ;H i' 



L ......... _L...1;L 



... 

 1 4. 



4. 4. ^L 4. 



%.-.4L'."4i. '4L 



- 



I'll.- <|iiinrun\ s\ 

 After Lelong) 



%. '4 4. 



L. 



4, -4=. 4- 



Fig. 21. "The triangular or alternating 

 syptf-m." ' After Lelong) 



,... I. ....>. 

 " '' 



- K 



I -.'-I 

 V 



U U *''U U % ' 



.U ...U . 

 ....k ..... 



-i. ^ 



:.:. "The hoxagonal system. 

 (After Lelong) 



