XVlll INTEODUOTION 



of the marine forms may be obtained from the Department 

 of Laboratory Supply of the Marine Biological Laboratory 

 at Wood's Holl, Mass., or from Ward's Natural History Es- 

 tablishment, Rochester, N". Y. 



Whenever possible, the living organism ought to be close- 

 ly observed before any work is done on dead specimens. It 

 is an excellent plan for the student to have a live specimen 

 before him while studying the anatomy of dead material. 



Apparatus required by the Student 



Each student should provide himself with the following : 



1. A medium-size and a small scalpel. 



2. A pair of medium -size and a pair of small (oculist's) 

 forceps, both with straight points and rough tips. 



3. A pair of fine curved scissors, which should meet ac- 

 curately at the tips. 



4. A pair of dissecting needles, made by fastening the 

 eye-end of stout sewing-needles into wooden penholders. 



5. A razor. 



6. Twenty-five slides and a half-ounce of cover-glasses. 



7. Two note-books, one for making condensed notes while 

 doing the laboratory work, the other in which to write in 

 ink a full and carefully worded account of the observations 

 made. 



8. A number of cards of bristol-board cut to the size of a 

 large postal-card. Upon these drawings are to be made. If 

 desired, a blank-book of thick calendered paper may be used. 



9. A hard pencil, either HHHHH or HHHHHH 

 Faber is recommended. 



10. A piece of india-rubber. 



11. An apron, preferably of rubber. 



12. A towel. 



Dissection 



The object of dissection is to separate the various parts 

 in such a manner as to display their shape and mutual rela- 



