JtTLT 29, 1910] 



SCIENCE 



131 



tory work; partly, no doubt, because the former 

 is not directly tested by college entrance examina- 

 tions. Examiners might well ask an occasional 

 question relating to what' the candidate may have 

 seen in the lecture room. 



The training of such assistants as are described 



in { 4 ) might be undertaken by " vocational " 

 schools. 



5. The following table gives the titles of those 

 laboratory exercises which, according to an in- 

 quiry made by circular in November and Decem- 

 ber, 1909, are most generally used by the secondary 



Measurement of volume (by scale and by displacement) 



Mass of unit volume of solid 



Principle of Archimedes : sinking bodies 



" " " floating bodies 



Specific gravity of heavy solids 



" " " light solids (with sinker) 



" " " liquids (by filled bottle, by submerged solid), 

 " " " liquids (by balancing columns) 



Compressibility of air 



The straight lever : first class 



Center of gravity and weight of a lever 



Equilibrium of three parallel forces in one plane 



Parallelogram of forces 



Inclined plane 



Laws of the pendulum .".. 



Testing a mercury thermometer 



Coefiicient of linear expansion 



Specific heat of a solid 



Heat of fusion of ice 



Heat of vaporization of water 



Determination of dew point 



Law of reflection of light '. 



Images by a plane mirror 



Images by a convex mirror 



Images by a concave mirror 



Index of refraction of glass 



Focal length of a converging lens 



Conjugate foci of a converging lens 



Shape and size of a real image formed by a lens 



Lines of force near bar magnets (iron filings) 



Lines of force near bar magnets (small compass) 



Study of asingle-fluid galvanic cell 



Study of a two-fluid galvanic cell 



Magnetic efl'ect of an electric current 



Resistance of wires by substitution (various lengths) 



Eesistance by a Wheatstone bridge 



The electromagnet 



The electric bell 



Uniformly accelerated motion (N. Y. ) 



Laws of " " (C. E. B.) 



Wave length of sound (N. Y.) 



" " ", ," (H.) 



Use of Eumford photometer (H.) 



" Bunsen " (N. Y.) 



Lines of force about a straight conductor (N. Y. ) 



Lines of force about a galvanoscope (H. ) 



Arrangement of cells for strongest current 



Battery resistance and combination of celk (H.) 



The electric telegraph (N. Y. ) 



Telegraphic sounder and key (H.) 



Electric motor (H. ) 



Study of an electromotor (N. Y.) 



Coil of wire moving in magnetic field (N. Y.) 



Study of induced currents (C. E. B.) 



The dynamo (H.) 



Study of a dynamo (N. Y.) 



75- 

 74 

 82 

 72' 

 92. 

 76 

 63 

 60 

 73 

 63 

 66 



34 1 68- 



28/ '^ 



^^03 



45}98 

 45} 91 



%Y^ 



27} 66 



