28 



ELEMENTARY LESSONS ON INSECTS 



III. In dissections of the ovaries note: 



1. The single oviduct, leading to the outside, in which 

 the ducts from the two ovaries are conjoined. 



2. The cluster of egg strings composing each ovary. 



3. The tapering form of each egg string (or tubule), with 

 bead-like enlargements where eggs are developing in it. 

 A nearly mature, oblong egg will lie nearest its outlet, 

 and a series of smaller less mature eggs, gradually 

 diminishing in size will run out to its tapering tip. The 

 eggs of each size mature and are deposited at successive 

 layings. By counting the egg tubes you will obtain 

 the number of eggs that may be laid at one time; and 

 multiplying this by the number of eggs in a tube, will 

 give the possible egg production of one female. 



IV. In cross sections prepared for microscopic study of the 

 tissues, observe the parts indicated in figure 9 and make 

 your own diagram, showing their relations within the body. 



