446 UNITED STATES CENSUS FORESTRY REPORT. [Nov. 



the United States under transverse strain, specimens eight centi- 

 meters square. This table embraces examinations of twenty-two 

 species, the points involved being similar to those in Table III., 

 with the addition of results of co-efficient of elasticity, direction of 

 pressure to grain of wood, modulus of rupture, and ultimate 

 strengtli. V, Behaviour of the principal woods of the United 

 States under compression ; embracing species, whence obtained, 

 soil, longitudinal compresssion and ultimate strength in kilos, and 

 pressure in kilograms, required to produce an indentation in 

 millimeters of 0-25, 0-51, 0-76, 1-02, 1-27, 1-52, 1-78, 2-03, 2-28, 

 2"54, 4"81, 5'08. The specimens of woods used in the above- 

 named series of experiments are deposited in the National Museum 

 at Washington, D.C., U.S.A., and in the museum of the arboretum of 

 Harvard University, Cambridge, Massachusetts, U.S.A. The surplus 

 material has been worked up into 12,961 museum specimens of 

 good size, showing as far as possible the bark, sap, and heart-wood 

 of each species, made up into sixty sets, and distributed among the 

 educational institutions of the United States and Europe. One of 

 these sets goes to the Museum of Science and Art, Edinburgh, 

 Scotland ; one to Home, Italy ; one to Lisbon, Portugal ; one to 

 Paris, France ; one to Montreal, Canada ; one to Sydney, New 

 South Wales ; one to St. Petersburg, liussia ; one to Konigsberg, 

 Germany, and the remainder to local museums in different American 

 States. 



Part 3 is devoted to the forests of the United States in their 

 economic aspects, comprehending a study of the forestry statistics ; 

 the lumber industry ; the character of the fuel used in the different 

 sections of the country ; consumption of charcoal ; consumption of 

 tannin ; losses by forest fires ; and a particular description of the 

 forests of each of the six grand forestry divisions into whicli the 

 United States have been divided, each State being described by 

 itself, with an account of the forest flora peculiar to each. The 

 general index to the volume comprises thirty-one doul)le-coliimn 

 pages of fine type. 



The maps in this volume are an interesting and noticeable 

 feature. There are in all thirty-nine maps. They are of two sizes : 

 one 7^ by 9^ inches, and one 9-^ by 15 inches, all printed in 

 colours, and different shadings. These maps show (1) the character 

 of the fuel used in the different sections of the settled portion of 

 the country ; (2) the proportion of woodland within the settled area 

 burned over during the year 1879; (3) showing the density of 

 forest growth in each of the States ; and (4) the distribution of the 

 different species in the various States, As indicating the mechanical 

 character of the work in these maps, I may say that the engrav- 



