THE LABORATORY 



The equipment for good work will depend very largely on 

 the energy, initiative ability, enthusiasm, and tact of the 

 teacher. A live animal, a live pupil, and a live teacher would 

 constitute a live and interesting class with no other equip- 

 ment, while, without these, an expensive equipment will arouse 

 little or no interest. The following equipment will be found 

 very helpful: 



(1) Magnifying glasses of ten and twenty magnification 

 power are found to be the most satisfactory for class use. 



(2) Compound microscopes. One for two students gives 

 good results, but one for each student is the ideal plan. 



(3) Dissecting instruments. These may be purchased for 

 $1 per set and kept in stock for class use, or each student 

 may use his own set. 



(4) Tables with lockers in which students may leave their 

 notes and instruments from day to day are essential. 



(5) Insect net. (See under Insects, p. 56.) 



(6) Cyanid bottle. (See p. 54.) 



(7) Material: (a) Marine material may be purchased of 

 the Marine Biological Laboratory, Wood's Holl, Massachu- 

 setts. 



(b) Inland forms may be obtained from Alfred W. Jones, 

 Salina, Kansas, or from N. O. Lawson, Geneva, Illinois. 



(c) Local material should be collected by the teacher and 

 class as field exercises. It may also be purchased inexpen- 

 sively from small boys, who are ever ready to earn a few pen- 

 nies. 



(d) Stock material may be kept in from 2 to 5 per cent, 

 formaldehyd or formalin. 



Fish, frogs, and such forms should have a few cuts in the 

 body to admit the preserving fluid to the internal organs. 



Take 1 part, by measure, of formahn and 19 parts, by 

 measure, of water for preserving insects for class use. 



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