﻿THE FERN BULLETIN 



41 



direct from a spray of Selaginella and Fig. 2 illustrates 

 the second printing operation, that is, a print from the 

 negative Fig. 1, instead of a direct print from the plant. 

 The original print thus produced in Fig. 2 was a white 

 and brown-black print on ordinary solio paper- The 

 negative can be used repeatedly for making any number 

 of prints on any kind of solar printing paper. The 

 ordinary blue print paper and the Vandyke paper are 

 the more simple and convenient to use, as no baths for 



toning etc. are required. The blue printing paper has 

 an advantage over the brown printing Vandyke paper 

 for the final print, in that a little tinge of blue in the 

 high lights makes them look clearer, whereas a little 

 tinge of brown in the high lights makes them look 

 dingy. A plant with thin leaves ma}" be exposed long 

 enough in making the negative to print through the 

 leaves and show the veins a little instead of producing 

 a mere silhouette. Observe that this result is shown 

 by the half tone lights in Fig. 2. The Vandyke paper 



