PRACTICAL STUDY OF PLANT FORMATIONS. 637 



of the subject. In this work the teacher can probably enlist the cooperation 

 of some of the students. In many cases photographs will illustrate cer- 

 tain features of the plant not well shown in a dried specimen, and the photo- 

 graph can accompany it. Access to greenhouses will enable the teacher 

 to further illustrate the subject. 



1126. The student should so far as possible keep a neat record, brief, 

 but to the point, of his work. This record should be supplemented by 

 preserved plants, or good photographs of the plants (or both), the notes 

 indicating the principal and individual formations to which it belongs, 

 whether a dominant species in a formation, whether alone or coordinate 

 with other species (preserve and cite them), or if a subordinate species 

 then note what relation it bears to the formation or the locality; also a 



Ridges with Pinus divaricata. 

 Zone of Larix laricina. 

 Zone of Picea Mariana, 



3 I 1 Zone of Ledum and Eriophorum. 

 t j 1 Central Sphagnum and Ulricularia. 



Fig. 536. 

 McMillan, Bull. Torr. Bot. Club, p. 502, 1896. 



few notes to indicate kind of soil (or depth, etc., of water in case of aquat- 

 ics) ; and a reference to a photograph where possible to show character 

 of formation and surroundings. With a numbered series of photographs, 

 one print would do duty in some cases for citation of several or a large 

 number of species. Cards or blank paper 5X8 inches might be used by 

 the students to keep their record, one card or slip for each species, the 



