Value of Physics in Forestry. 397 



sent the subjects as basic principles and thus to give a secure foun- 

 dation for the purely technical work following. It is probable 

 that Prof. Clark assumes a pretty broad definition for physics. 

 The basic principles involved in these different courses are com- 

 monly presented in the teaching of those courses. For instance, 

 in college courses in Botany, the principles of osmosis and capil- 

 larity are universally presented. Again in geology, the questions 

 of the results of the effect of freezing on soils and rocks and the 

 formation and motion of glaciers, sedimentation, etc., is presented 

 in the courses on Geology, as taught in our colleges. Some of 

 these last principles are presented also in Physiography and Phy- 

 sical Geography. In Mineralogy, the physical properties of crys- 

 tals would without question be taught. However, the correlation 

 of the basic principles brought out in the various subjects, in a 

 single subject like physics, is without question of value to the 

 undergraduate student in forestry. It is hoped that the presen- 

 tation of the outline below, will bring out expressions from other 

 foresters in this country^ either regarding physics or other foun- 

 dation subjects- 



Forestry Courses That Presuppose Some Knowledge of Physics. 



Forest Engineering : Magnetism, use of compass, deviation from 

 the true north and its variation with locality ; telephone lines, 

 action of transmitter (variable contacts), and receiver (induction), 

 insulation and accidental grounds ; batteries, their use, abuse, care, 

 essential parts and renewal ; strength of materials, bending and 

 compression. 



Wood Technology: Physical and mechanical properties of 

 wood : density and its determination ; the microscope, its use and 

 care, its lenses, the principles involved in the instrument and in a 

 compound lens, and cause for the expense of a good instrument; 

 distillation. 



National Forest Practice: Hydro-electric power development; 

 electricity, units involved ; basic principles underlying genera- 

 tion, detection and measurement of electricity; fundamental con- 

 ceptions of the dynamo, the motor, the transformer and the cur- 

 rent rectifier; relation of electrical to mechanical power; ef- 

 ficiency ; long distance transmission by both S. C. and D. C, sys- 

 tems, at high voltage and at low ; loss on the line. 



