92 Practical Zoology. 



cork wedge should be placed between the jaws. The skeleton is 

 to be sewed to the card with a single thread of the color of the 

 bones. The bones are to be held by loops that pass up from 

 the under side of the card, around the bone, and back through the 

 same hole. All holes are to be punctured from the upper sur- 

 face of the card, and are better made with a pin slightly larger than 

 the needle used in sewing. It is important to determine exactly 

 where each bone is to lie, so that the hole may be made exactly 

 under the middle of the bone. Now puncture holes as directed 

 under the front and hind angles of the jaws, and under the pelvis 

 beneath the hip joints. After securing the head and pelvis, deter- 

 mine carefully where the bones of the limbs are to rest. Pass 

 loops around near each end of the longer bones, but a single loop 

 in the middle will serve for the short bones of the ringers and toes. 

 If the skeleton is from a specimen used for dissection, the breast- 

 bone will have been severed. Bring the cut ends together and 

 sew firmly in place. The shoulder blades should meet in the 

 middle line a short distance back of the skull. Print the label 

 " Skeleton of a Frog" at the foot of the card and write your name 

 on the back of the card. 



To preserve the skeleton get a shallow box, such as a shallow 

 cigar box. Fit the card to the box and tack it to the bottom. A 

 good plan is to remove the wooden cover and replace it with a 

 glass lid. Paste strips of paper or suitable cloth along the edges, 

 and the case will exclude dust. 



THE FROG'S SKELETON. 



1. Note how open and light the skull is, and how easily the 

 bones are cut. 



2. Count the parts of the spinal column ; these are the verte- 

 brae. The long bone terminating the spinal column is the urostyle. 



3. Observe the long bones of the pelvis, parallel with the uro- 

 style. What makes the frog humpbacked ? 



4. The fore limb has, in the upper arm, the humerus ; in the 

 forearm, the radius (same side as the thumb) and the ulna ; in the 



