I read this book a couple years ago and found it to be an incredible warning to the churches. It also was part of several things God used to draw me out of the lukewarm, mile-wide, inch-deep “churches” that I was attending.
The back of the book sums it up succinctly:
Some of Ryle’s most pungent writings have hitherto tended to be lost in his larger volumes. This book brings together eight addresses with a common theme. Together they sound a prophetic and much needed warning to the churches.
I stumbled across this book by accident (divine providence) on Ebay. I believe this book is currently out of print but you can purchase it here on Amazon, and you can get its modern edition entitled Churches Beware here on Amazon.
If you can find yourself a copy, I strongly recommend you get it. This 171 page volume is a must-have for all Ryle fans and those who are dissatisfied with the current shameful state of the Church.
Here’s one review from Amazon:
Outstanding teaching from an old source, demonstrating the need for discernment in the Church today. Ryle tells us how we can avoid false teachings, by not even accepting a little error any more than we would accept a little poison. Well worth the reading for discerning Christians.
Atheist Michael Ruse from Saving Darwinism from the Darwinians from the May 13, 2000 National Post said the following:
Catholic bishops have condemned us as heretics and have cursed us over 100 times with anathemas pronounced by the Council of Trent and the 2nd Vatican Council. According to the Catholic Encyclopedia, “Every heretic is to have part with the Devil and his angels in the flames of eternal fire, unless before the end of his life, he be restored to the Catholic Church.” What a paradox! Christians, who embrace God’s infallible truth, are eternally condemned by this apostate religion, and then called Catholic-bashers for trying to rescue Catholics who are enslaved by doctrines of demons (1 Tim. 4:1).
Your sermon of the week is the one you’ve all been waiting for:
“Doctrine divides!”
Men tell us that our preaching should be positive and not negative, that we can preach the truth without attacking error. But if we follow that advice we shall have to close our Bible and desert its teachings. The New Testament is a polemic book almost from beginning to end . . . . It is when men have felt compelled to take a stand against error that they have risen to the really great heights in the celebration of the truth.
Your Wednesday sermon of the week is 

Modern American dating is no more than glorified divorce practice. Young people are learning how to give themselves away in exclusive, romantic, highly committed (at times sexual) relationships, only to break up and do it all over again. God never intended for His kids to live like this. And instead of stepping in and doing something, many Christian parents simply view these types of relationships as a normal and necessary part of growing up. Unless your child is wiser than Solomon, stronger than Samson, and more godly than David (all of whom sinned sexually), they are susceptible to sexual sin, and these premature relationships serve as open invitations. . . . Being involved in such exclusive relationships before you are ready to be married is like shopping without any money; either you will leave frustrated, or you will take something that doesn’t belong to you.