Taylor on Geology in our 'Preparatory Schools. 319 
and general notes should be written in ink. For a short course 
in geology we should say that the monograph should consist of 
not less than four species of at least four drawings each, namely 
one each of the dorsal and the ventral surfaces, and two sections 
showing internal structure. For methods of sectionizing fossils, 
and determining their internal markings we could not do better 
than refer the reader to Dr. Winchell's Geological Studies. 
3. Collect, classif \-, label and carefully arrange in a neat box 
or case, at least twenty species of fossils, simply giving family 
names. Each specimen should have cemented to it a small 
numbered ticket referring to a catalogue containing notes giving 
name, locality and geological formation of the fossil as well as 
the date and by whom labeled and collected. The ticket should 
be no larger than necessary to contain the number, which should 
be written in ink and with a pointed pen, and may vary in shape 
and color in order that the collections of different students may 
be kept separate. 
///. Maps. 
One map for each student; standard sizes, say not over 30 x 
36 inches. If outline maps can not be procured use heavy paper 
prepared for architectural drawings or cloth. For a suitable 
map wc usually select a map of North America, United States, 
or a part of it, or the map of some state. The colors, which 
should be the standard agreed upon by the International 
Geological Congress, the United States Geological Survey, or 
those adopted by custom, may be made in many ways, but we 
have had better success when using Diamond dye colors. 
These colors are sold in ten cent j^ackages by all druggists, and 
one package of each color needed will sup^^lv a class of fifty, 
or more. These colors should be filtered after being dissolved 
in hot water, and spread on with a tolerably large camel's-hair 
brush. In coloring the map great care should be taken to get 
the outlines sharp and not to make the tints too strong. Dif- 
ferent maps requiring similar effort may be given to each 
student. These maps, when accurately drawn and carefvdly 
mounted on rollers maybe made quite useful in class recitations. 
Maps on economical geology may be drawn, on a smaller 
scale, illustrating distribution and production of coal, petroleum, 
