A letter to the Reverend Mr. Tong, Mr. Robinson, Mr. Smith, & Mr. Reynolds. Occasion'd by the late differences amongst the dissenters : Wherein is consider'd the regard dissenters ought to pay to human forms in matters of faith. With some general remarks on their late book. To which is added an appendix, containing two letters sent by some dissenting gentlemen to their ministers. And other papers. By a Layman.