2. Despite the necessity for treating various sciences, the book is remarkable for its continuity of thought. The interrelation of scientific facts is constantly and clearly pointed out.

3. The treatment is clear-cut, brisk, and thorough, the material well chosen and up to date, while the general workmanship of the book renders it attractive and serviceable.

4. There are over 90 laboratory exercises in the book, a number of them entirely new, and all of them illustrative of the text.

5. Reference reading is encouraged, and lists of carefully selected standard reference books are suggested. Those teachers, however, who do not care to take up detailed work of this sort may give a satisfactory course by using in connection with the book United States Government bulletins alone, to which definite reference is made in the lists of reference readings throughout the book.

TEACHERS

call the book “thorough,” “practical,” “comprehensive,” “clear,” “satisfactory,” “a great aid to the science teacher.”

Mr. N. P. Lawson of Taunton, Washington, writes:

“I have examined Rowell’s ‘Introduction to General Science’ quite carefully. It wears. The more I use it the better I like it. There is room left for the teacher. He doesn’t have to crowd himself in. This book can hardly fail to inoculate any one with the bulletin habit, in which I am a firm believer. In its encouragement of wide reading and first-hand acquaintance with books through the excellent references given, this compact little volume is an education in itself. If I were with your company I should wish to push this book. I believe in it.”

The Laws of Heredity

By G. ARCHDALL REID, M.B., F.R.S.E.