This book was possibly published in 1895, but the edition we have now is from 1922. Friedrich Max Müller was a respected linguist and Sanskrit scholar and had a scholarly relationship with the Brahmo Samaj. He delivered four lectures in 1861, which were published in the form of a book. This book referred to a chart known as the 'Aryan Family' of languages. Mirza's nemesis was the Arya Samaj and he set out to prove that Arabic that was the 'mother of all languages.' Ultimately the book was an abandoned project, with no chapters that have reached us, but he challenged Müller and anyone else to a prize of 5,000 rupees, and used very crude and coarse linguistic comparisons on how he was going to Arabic was the 'mother of all languages'. It also appears that the 'you' adversary in the entire book may be Müller.
One point of interest is that Mirza Ghulam Ahmad maintained all through his life (from Braheen-e-Ahmadiyya to Chashma-e-Marifat) that languages and even minor dialects were created by God directly, and all changes in languages are with God's will. He never explains how that idea coincides with evolving changes in languages that are mentioned in this book. Perhaps this is one reason why it was not published in his lifetime. The other reason may be that the contemporary state of linguistic research was much more advanced than the theories of this book, and Mirza took on an eminent linguist in a way that does not even rise to a proper definition of what it is.