before their wilting, and the entire collection represents the subjects 

 as we see them in nature far better than do pressed herbarium 

 specimens. 



A unique and original standard of comparison is made use of in 

 these pictures, which enables one to tell at a glance the size of the 

 object, however much it may be enlarged or reduced in the picture. 

 This is essential for the greatest educative value of the picture, as 

 objects of all sizes are brought together into plates of uniform size, 

 but the natural size of the object is at once apparent by the back- 

 ground, which serves as a uniform standard of measurement. 



In showing the flowers an entire flower cluster is represented in situ 

 upon the branchlet, and the same is true of the fruit, parts of both 

 being shown enlarged when necessary to bring out characters of 

 specific distinction. The leaves are shown attached to the brachlets 

 in both of the above pictures if to be found at the seasons when they 

 are made, the more unusual forms being shown by detached speci- 

 mens, or by an additional negative in case of such leaves as do not 

 attain full growth until after the maturity of the fruit. The winter 

 buds, by which we are able to distinguish most of our trees in winter, 

 are shown on branchlets, generally of the entire previous season's 

 growth, by a separate negative. 



Prints from all the above negatives pertaining to a species are 

 gathered together in the make-up of a single plate, which is labeled 

 with technical and common names, the season of blossoming and 

 maturing of fruit, and such other data as may be of importance. 



With the aid of these plates the positive identification of our 

 various trees is made a very easy matter, even for a bright school 

 child, without the use of botanical descriptions. 



THE PRICE OF "TREE STUDIES " IS AS FOLLOWS. 



In Cloth Binding, ....... -S3. 00 per Part. 



In Half Morocco Binding, ..... &5.OO per Part. 



It is the same whether bound in volumes or in portfolios. 



When both Series A and B are ordered a discount of 10% is 

 allowed on both. 



We are prepared to furnish stereopticon views of any of the sub- 

 jects of our plates at 50 cents each, or in quantities of twenty-five or 

 more at 40 cents each. Prices of contract -print photographs, trans- 

 parencies and enlargements especially appropriate for school-room 

 display quoted on request with statement of the size desired. 



Address, ROMEYN B. HOUGH, 



LOWVILLE, N". Y. 



