270 
The Ohio Naturalist. 
[Vol. VIII, No. 4, 
quality it is none the less accurate. This shows that the book 
was written by men who are familiar with the art of teaching. 
The clear statements, the logical development of the subject, and 
the rigid scientific accuracy are silent testimonials to the ability 
of the authors. The same authors have prepared a laboratory 
manual to accompany this text. It is useless to say it possesses 
the same merits as the text. It gives the student ample instruc¬ 
tions without reaching all of his conclusions for him. This 
manual causes the student to work and makes him think while 
he works.” J. C. H. 
Date of Publication, February IS, 1908. 
