VIEWS OF TYPICAL TREES, ETC. Having rather unusual oppor- 

 tunity of studying trees in the field, on account of personally gathering 

 the woods used in AMERICAN WOODS, the author is in thfe habit of making 

 photographs that are of especial interest in the study of trees. 

 The subjects selected are mainly as follows : 



(a ) Isolated individual or small groups of trees, which show characteristic 

 habits of growth, natural environment, etc. Deciduous species are photo- 

 graphed generally both in summer and winter, to show both leafy and leafless 

 condition.* 



(b) Characteristic barks of trees, a one-foot rule being displayed to show 

 size of trunk. 



(c) Flowers of trees, and such conditions of leaves as exist at the corre- 

 sponding season of the year. 



(d} Fruits and nature leaves. 



(e) Leafless branchleis, showing the interesting characters by which the 

 trees may be known in winter. 



The subjects of classes c, d and e are photographed while fresh, even before 

 their wilting, against a background ruled into square inches, by means of 

 which natural sizes are at once apparent. The pictures of classes b, d and e, as 

 pertains to the trees of the Northern States and Canada appear in our HAND- 

 BOOK OF THE TREES. 



Prices: Contact-print photographs (mostly 5x7 or 5x8 in., excepting of 

 classes b and e} unmounted, each 20 cents ; mounted, 25 cents. Stereopticon 

 views, 50 cents ; $10 per twenty-five. Enlargements and transparencies quoted 

 on request. 



*In ordering pictures of trees, please state whether leafy or leafless condition of trees is 

 desired, or both. 



MOUNTS OF WOODS FOR MICROSCOPE. 



These are transverse, 

 radial and tangential 

 sections, mostly 1-1200 

 in. thick, stained with 

 methyl green and 

 mounted in Canada bal- 

 sam. They are of great 

 value for study with 

 the microscope, and 

 for projection with the 

 projecting microscope when considerable magnification is desired. It is in 

 this way only that radial and tangential sections can be projected with entirely 

 satisfactory results. The identification of many woods is possible by simply 

 examining the end view of the grain transverse section with the unaided 

 eye or with hand-glass, if we have authentic specimens to compare with, as is 

 afforded in our AMERICAN WOODS. 



Some species, however, are so closely alike that greater magnification 

 is required, and then the compound microscope must be used. For such cases of 

 comparison our Mounts of Woods for the Microscope are indispensable. 



They are suitable for examination with high power magnifier, owing 

 to their extreme thinness and the thoroughness of the staining 1 , which gives 

 emphasis to structural features, markings of cell-walls, etc. These mounts, 

 while beautiful to contemplate under the microscope, as objects of curiosity 

 to the novice, are also of much practical scientific value to the technical student, 

 and are indispensable in the study of wood histology. To the student and 

 wood expert, to whom the knowledge they impart becomes an important asset, 

 they are invaluable. 



Price SOcts. each, 20% discount in quantities of 25 or more. 



