Appendix. 115 



Miss Jane Newell's Botanical Readers may profitably be 

 used to vary the exercises. 



MICROSCOPES. 



Teachers should, if possible, secure for the use of their 

 pupils the simple dissecting microscope invented by Prof. 

 Barnes and supplied by the publishers of this work. There 

 should be one for each pupil, but half as many are better 

 than none. Perhaps the teacher will be obliged to get one 

 to show the trustees and others in power before he can 

 satisfy them of its utility. A lens of one and one-half inch 

 focal distance is the most useful. Four or five lenses can 

 be used together on one stand, so as to give a power of 

 twenty diameters or more, which shows cellular structure, 

 pollen grains, and circulation of blood in a frog's foot very 

 well. Ten of these microscopes cost about as much as one 

 good compound microscope and are worth considerably more 

 than ten times as much to the pupils. Dissecting needles 

 are indispensable, and can be made by putting handles on 

 No. 2 sewing needles. Strong pincers will enable one to do 

 this. One needle should be ground flat to use in cutting. 



A closed cupboard is necessary for the safe storage of 

 the microscopes, jars, etc. The shelves should be a foot 

 wide and ten inches apart. Each set of apparatus will 

 require about a foot shelf space. These spaces might be 

 separated by partitions, making pigeon holes for each 

 pupil. 



