http://www.museum.tv/

Full streaming episodes are here, follow these instructions -

Go to the above site, put your cursor over "Collections", scroll down and click "Search the Archives", then click "Browse the Archives catalog" on the new page.

In the search box under Index Class, select "TV, Radio and News", under Media select "TV", under Program Type select "Children's", and lastly for Online Availability set it to "Public", and then press search.