Meantime I am mentally building up my film story. In story form it must grip the interest of the general public, and yet I have to keep to strict military correctness. I think of my main title. That in itself is a great thing. It has to epitomise the story of the whole film. It has to be short and it must "hold." The title once decided upon, the first reel must deal with preparatory action. I then take the lists prepared as described and call for my sections. For instance, number twenty section, box fourteen; number twelve section, box six; and so on, gradually building up the first reel. The sub-titles must be appealing and concise, and in phraseology that can be easily understood by all. Eventually reel number one is finished. All the sections are joined together, with spaces marked for the titles. The same process continues with the other reels. Number two must finish their story so far as preparatory action goes. You are then ready for the thrill, and the harder you can hit that thrill into reels three and four the greater the ultimate success of the film. Reel five finishes the story. But after seeing a battle film through full of suffering and agony, as it unavoidably must be to be genuine, you must not leave the public with a bitter taste in their mouth at the end. The film takes you to the grave, but it must not leave you there; it shows you death in all its grim nakedness; but after that it is essential that you should be restored to a sense of cheerfulness and joy. That joy comes of the knowledge that in all this whirlpool of horrors our lads continue to smile the smile of victory. Therefore the film must finish with a touch of happiness to send you home from the picture theatre with a light heart--or at least as light a heart as circumstances permit. The film is now edited, and it goes into the printer's hands. A positive print is made from it on film stock, and after the printing the copies are returned to the dark-room and the process of developing is gone through again, as in the case of a negative. The print is then dried and joined up in its right order, and so divided that it makes five reels. The titles by this time have been corrected from the military point of view by the War Office, and are printed for insertion in their appropriate position. The length of reading matter controls the length of the title to be printed. In some instances it will take ten seconds to read a title. Ten feet of film is therefore necessary for insertion between the scenes to explain them. In other cases three feet of titling suffices.