Welcome to WikiTree and G2G, Barbara.
There is a WikiTree profile for John Prince Thorndike, his profile ID is Thorndike-95.
It may help to catch the attention of interested people by editing this post and entering his profile ID below the line that says "WikiTree ID/URL if this relates to a person or free-space profile:".
Also, you may want to add some "Surnames/Tags" like photos and/or thorndike (surnames/tags are entered in lowercase letters only. They are separated by a space). This way people "following" these tags/surnames will see your post in their "G2G Feed".