The Microscope. 349 



instantaneous photographs is composed of coarse sugar and powdered 

 magnesium, of each one pai't, and chlorate of potassium two parts. 

 If the sugar is too fine the explosion will be violent. 



BOOK REVIEWS, 



Primary Methods in Zoology Teaching, for Teachers in Common 

 Schools. Illustrated. By W. P. Maaton, M. D. Boston: Lee & Shep- 

 ard, 1888. 



This latest addition to Dr. Manton's Practical Helps in Natural 

 History series, was originally contributed to an eastern journal of 

 education, and meeting with so kindly a reception by the readers of 

 that periodical, it was decided to republish in manual form. 



The text is a curious blending of comparative anatomy and phy- 

 siology, with enough microscopy to enable the teacher to instruct 

 even the youngest pupil. But the chief merit of the little book lies 

 in the suggestions it gives in regard to making the study of zoology 

 interesting, — something more than the mere learning of names. 



Teachers and others, who have had little experience in zootomy, 

 will find much in this manual of value and assistance to them in the 

 practical parts of their work. It is well worth a careful reading, and 

 we feel sure that if the instructions are followed as given, the results 

 will be eminently satisfactory. 



Darwinism, A. brief account of the Darwinian theory of ihe origin of species. 

 By David Stair Jordan, Ph. D., M. D. Chicago: A. B. Gehman & Co., 

 1888. 



Dr. Jordan presents in this essay a brief and popular statement 

 of the main features of a theory which is known, by name at least, to 

 every one. The matter is treated in the writer's well-known, clear 

 and concise manner, and afPords pleasant reading, while at the 

 same time it epitomizes the features of the theory of organic evo- 

 lution. 



Proceedings of the American Society of Microscopists. 1888. Pp. 359. 

 With each year the record of the proceedings of this Society 

 grows in interest, and this volume, for 1888, proves to be no 

 exception. The papers, of which a number have appeared in The 

 Microscope, are mostly of high character, and show, in many 

 instances, evidences of much hard work and original research. We 

 fear, however, that the long delay in getting out the volume will 

 detract somewhat from the interest in its contents. The Committee 

 on Publication cannot be blamed for this delay, as a number of 



