On Long, Short, and Weak Sig& By J. Soellierg Wells.
Second Edition. (Churchill and Sons.)—This is an enlarged form of Mr. Wells's essay on the modern theories of the accommodation and refrac- tion of the eye founded on the scientific researches of Von Graaf° and Donders. It will be a consolation to many a literary man or needle- woman troubled with these complaints to know that they may easily in most cases be cured by the use of proper glasses, and Mr. Wells im- presses on his readers that the number of the required Ions should be accurately fixed by the medical man, and not left to the optician. This is good sense. The more theoretical part of the treatise we must leave to the medical journals.