It is on top of the kitchen table in last room , the kitchen table is right on the end :)
you have to get the key to the diary first then you go into the trash can and you have to pull and push objects out of the way to get to the paper ps:dont get smushed
you have to go underground and go through some rocks and find the other piece, then you bring it to the guy in the tree house. (The guy with the potions)
You get the diary key and the torn page. Use the diary key on the diary and combine the torn page. Then jump on the lamp as low as it can go and turn it on. Put the paper under it.
the ripped one
It is on a shelf above the computer desk. You need the key (from the aquarium) and the torn page (from the trash can in the kitchen).
it says to get a lemon and a piece of paper
Cj,s diary key,remote controller for toy car,piece of paper that smells like lemon juice from table,and last but not least the morse cold key from cj,s room.
you put it under c.j`s lamp to get the message
Get the torn diary page out of the trash in the kitchen. Then get the piece of paper from the kitchen table, which is a secret message. Go back to C.J's room and jump onto the lamp to bend it close to the desk. Turn on the lamp, then click 'use' on the secret message in your inventory. You never actually put the diary under the light. only the paper.
The goal when you are in the trash is to get the piece of paper. You need to click on objects that you need to move to move them. Have fun!
On the page will be a lemon a piece of paper and a light. If you haven't already got the piece of paper from the kitchen table do it now. There is a mini puzzle to get the paper. (The kitchen table is as far right as you can go in the house). After you get the paper go back to cjs desk (where the pc is). Push the lamp down and click use on the paper it will tell you what to do next.
Click on the eye piece (when you are big) or on the microscope slide (when you are small) to see C.J.'s warning note.