66 COWARD & Harden, Da/tons Lecture Sheets 



Sheet 53. 



Plate VIII. 



Figure similar to that of fig. 6 in the previous 

 arrangement, which represents the hexagonal form of 

 snow crystals as the result of the packing of atoms. One 

 important difference exists : on the sheet, half the circles 

 represent hydrogen atoms, half represent oxygen atoms ; 

 in the book all the atoms are alike, and apparently each 

 small circle represents an " atom " of water. 



