REVIEWS. 399 



ing to the variation, iiabits, and life-histories of some of our British Butterflies, 

 and in which he will find an attempt to sei clearly before him the structural 

 peculiarities of their eggs, larva;, pupae, and imagines, those peculiarities which 

 are now considered of importance by systematisis being most fully dealt with. 



The chapters on the Egg, Caterpillar, Chrysalis, and Imago will give the 

 collector the clues he requires to follow up the more advanced branches of the 

 study. The chapters on Collecting, Killing, Setting, and Preserving Insects 

 will be found valuable, being based on Mr. Tutt's long practical 'experience. 



There are lo fine plates and 45 illustrations in the text. The book forms 

 a nice companion volume to that on British Moths, noticed in our April'part. 



Insects and Spiders : Their Structure, Life-Histories, and 

 Habits. By J. W. Tutt, F.E.S. Cr. 8vo, pp. 116. (London: George Gill 

 and Sons. 1896.) Price i/- 



This, which is Part II. of Gill's Practical Series of Object Lesson Books, 

 describes the General External Characters, Internal Organs and their functions, 

 and the Metamorphoses of Insects, with descriptions of the different orders of 

 Insects, in a series of lessons which are meant to be merely suggestive, the 

 point aimed at being to lead the child to observe. There are a number of good 

 illustrations. 



Earth Knowledge : A Text-Book of Physiography. By W. 

 J. Harrison, F.G.S., and H. R; Wakefield. Part I., 9th edition, and Part II., 

 6th edition. Cr. 8vo, pp. 266 and 240. (London: Blackie and Son. 1895.) 

 Price 2/- each. 



So considerable have been the changes and additions to these new editions 



that they are practically new books. Care has been taken to bring them up to 



date, and to embody the most recent discoveries in science. There are upwards 



. of 220 illustrations in the two books, besides which both are accompanied by 



good indexes. 



By the Deep Sea : A Popular Introduction to the Wild Life 



of the British Shores. By Edward Step. F.L.S. .Second edition. Cr. Svo, 

 pp. 322. (London: Jarrold and Son. 1896.) Price 5/- 



To naturalists visiting the seashore we can recommend no more interesting 

 book than the one before us. It treats of all those things likely to be met with 

 — Low Life, Sponges, Zoophytes, Jelly Fishes, Sea Anemones, and the 

 rest. It contains more than 120 illustrations, is written m a popular style, and 

 cannot fail to interest every reader. Besides an Alphabetical Index, it contains 

 that which we seldom find in popular works — a Classified Index of Species 

 referred to. This we consider a very valuable addition, and one which authors 

 of similar books would do well to follow. 



The Biological Problem of To-Day : Preformation or Epi- 

 genesis ? The Bases of a Theory of Organic Development. By Prof. Dr. 

 Oscar Hertwig ; translated by P. Chalmers Mitchell, M.A. Cr. 8vo, pp. 

 XX. — 148. (London: William Heinemann. 1896.) Price 3/6. 



This is an exceedingly interesting work, requiring very careful and atten- 

 tive reading. It starts by asking the question. What is Development ? Part I. 

 treats of Weismann's theory of the Germ-plasm and Doctrine of Determinants ; 

 and Part II., Thoughts toward a Theory of the Development of Organisms. 



Lessons in Organic Chemistry. Part L, Elementary. By 

 G. S. Turpin, M.A. (Camb. ), D.Sc. (Lond.). Crown Svo, pp. vi. — 140. 

 (London : Macmillan and Co. 1894.) Price 2/6. 



A series of lessons adapted to the Elementary Stage of the South Kensing- 



