1. Some Very Important Points About
Reading Fingerprints

2. A LOOP
pattern in which one or more ridges enter upon either side, recurve, touch or pass an imaginary line between delta and core and pass out or tend to pass out upon the same side the ridges entered.

3. RADIAL and ULNAR LOOPS
The terms "radial" and "ulnar" are derived from the radius and ulna bones of the forearm.  Loops which flow in the direction of the ulna bone (toward the little finger) are called ulnar loops and those which flow in the direction of the radius bone are called radial loops. 

4. VERY IMPORTANT:
The classification of loops is based on the way the loops flow on the hand (not the card), so that on a fingerprint card for the left hand, loops flowing toward the thumb impression are ulnar, and loops flowing toward the little finger are radial.
Loop (Ulnar on left hand, Radial
on right hand)
Loop (Radial on left hand,
Ulnar on right hand)

5. (from your book: as you look at your hand) now, as printed:
Loop (Ulnar on left hand, Radial
on right hand)
Loop (Radial on left hand,
Ulnar on right hand)

7. Henry Classification System
About Henry System
ex.: if there is a whorl on your left thumb and
right middle finger, with the rest of the fingers having loops or arches, then:
= 5_
your primary classification

8. Remember only whorls are given a number!!
Chapter 4
right
left
= 5
Remember only whorls are given a number!!
Kendall/Hunt

9. About 25 percent of people have loops and arches with no whorls, so a primary classification of 1/1 is quite common. Be careful not to classify loops as arches.
Overall: About 65 percent of all fingerprints have loops – with arches being the least common

12. https://www. youtube. com/watch
The Dangerous Few – Children who show signs