I have not yet repaired any electronic versions of book on archive.org --but I hope to be able to do so soon. In the meantime Google has taken a suggestion to permit open access to Richard Pischel's De grammaticis prakriticis ... (1874). Brianna of The Google Books Team writes:
We’ve completed our review of this book, and it has been approved for full view. You should be able to view the complete contents here.