406 Olf INSECT ANATOMY. 



stand to what parts they belong. By examining the principal 

 sections with a low power, a general map of the most important 

 organs, and their actual and relative position, appears spread out 

 before the observer. By a series of slices a corresponding map of 

 each organ or parts of organs is obtained, and by piecing together 

 the parts contained in each slice in their original order, the continuity 

 and contiguity of the several structures is made out. In this way 

 the drawings have been made which are now exhibited, and the 

 result exemplifies the use of this method of obtaining exact figures, 

 illustrative, first, of regional and ultimately of systemic anatomy. 

 The details with which the general outlines are filled up, have been 

 drawn from other series of preparations and dissections of parts 

 obtained by varying the sections. The number and complicity of 

 organs, and the minute details of structure, may surprise many who 

 have not before considered the subject of insect anatomy, and their 

 beauty and delicacy will, I hope, prove sufficiently attractive to 

 counteract the tedium of listening to the descriptions which I have 

 yet to offer. 



(To he continued.) 



Note. — As it has not been found practicable to reduce the diagrams, 

 or to make fresh drawing from which illustrations to accompany 

 the text could be produced in time for publication in this 

 volume, the plates and descriptive text will follow in our next 

 number. 



