Introduction. 



This comparative study of the two cranberries, 

 O,macrocarpus and O,oxycoccus, found growing near McLean 

 Hew York, was taken up for the purpose of determining 

 whether or not there was any differences in structure 

 of these two plants. 



Material of the two plants was carefully gathered, 

 killed, and preserved, October nineteenth, when it was 

 possible to obtain mature fruit as well as leaves, stems, 

 roots, etc. 



At the same time that I was gathering material for 

 micro scopical study, I took up several clumps of each 

 species and set them in a shallow tank in the greenhouse 

 in hopes of having plenty of fresh material to work on 

 during the winter. The large form O,macrocarpus re- 

 mained green during the winter, but had not started to 

 grow the middle of March, while the small form O,oxycoccus 

 started to grow early in February and was in full bloom 

 by the twentieth of February. I made no attempt to 

 make use of the flowers, as I had only the one form at 

 that season of the year, but expected to make a compar- 

 ative study of the flowers in spring. 



In this study I shall endeavor to point out only 

 a few of the common likenesses of the two plants, or 

 should there be difference, I shall also note that with 

 drawings to make plain any of the various parts. 



