150 Proceedings of Indiana Academy of Science. 
ment of leaves of Specularia perfoliata the circumference of the stem was 
divided up equally for the leaf insertion. 
Among the large number of the plants above mentioned, however, I saw 
five other specimens of Specularia perfoliata which looked somewhat differ- 
ent from the others. On examining these more closely I found them to 
have more leafy stems and by counting the leaves in a spiral as I did with 
the others I found that there were five leaves to a spiral counting the first 
one instead of the usual four of the other plants. Also I saw in these 
specimens, that it was necessary to make four circuits of the stem, instead 
of three as in the other plants before I found a leaf which stood directly 
over the first leaf with which the count was begun. The five specimens, 
just mentioned, of Specularia perfoliata grew about the center of a con- 
siderable number of other specimens of the same species as well as other 
plants. They were some larger than other specimens of the same spe- 
cies, but attracted my attention at close range first on account of the fact 
that they were some taller than the others and then on account of their 
denser foliage. The leaves of these specimens also divided the circumference 
of the stem equally as regards the insertion of the leaves. Those five 
plants having the greater number of leaves showed therefore a yery delicate 
balance and arrangement with reference to the light which is extremely 
Important for leaves of autotrophic plants. 
