330 AN INTRODUCTION TO ZOOLOGY. 



sitive student has an opportunity of gradually master- 

 ing fclie repugnance felt to handling dead organisms, 

 instead of having to conquer it all at once. It must 

 be remembered, however, that this repugnance is 

 merely physical squeamiahness, and should, therefore, 

 not be too much indulged. Let the student be fas- 

 tidious about the means by which his material is pro- 

 cured, avoiding all cruelty, but learn to conquer 

 fastidiousness in other respects. 



Quite as necessary to the zoological student as the 

 arts of reading and writing, if not more so, is the art 

 of drawing. The student not only may, but mMsi, 

 learn to copy diagrams accurately from books, and to 

 make a clear and plain sketch of every animal, skele- 

 ton, dissection, or microscope preparation, and also a 

 diagram (i.e. a conventional representation, in outline, 

 map,: or section) of structures which are too compli- 

 cated for all their parts to be represented in detail. 

 Pencil, coloured chalk, pen and ink, colours, and neutral 

 tint, any or all of them, will be found useful. Diagrams 

 and drawings should be entered in a note-book or 

 sketch-book kept for the purpose, with a description 

 of the specimen they '^qvq :Copied from, and a note of 

 the date and place at which it was found, or of the 

 museum in which it has been studied, as the case 

 may be. 



In dissecting cockroaches and caterpillars, it will be 

 necessary to use a lens. In order to see the structure 

 of tissues, a microscope of good magnifying power 

 is required. ^ In learning its use, books may be con- 



